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256 lines
8.9 KiB
ReStructuredText
Setting up restic with Amazon S3
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================================
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Preface
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-------
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This tutorial will show you how to use restic with AWS S3. It will show you how
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to navigate the AWS web interface, create an S3 bucket, create a user with
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access to only this bucket, and finally how to connect restic to this bucket.
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Prerequisites
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-------------
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You should already have a ``restic`` binary available on your system that you can
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run. Furthermore, you should also have an account with
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`AWS <https://aws.amazon.com/>`__. You will likely need to provide credit card
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details for billing purposes, even if you use their
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`free-tier <https://aws.amazon.com/free/>`__.
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Logging into AWS
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----------------
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Point your browser to
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https://console.aws.amazon.com
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and log in using your AWS account. You will be presented with the AWS homepage:
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.. image:: images/aws_s3/01_aws_start.png
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:alt: AWS Homepage
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By using the "Services" button in the upper left corder, a menu of all services
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provided by AWS can be opened:
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.. image:: images/aws_s3/02_aws_menu.png
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:alt: AWS Services Menu
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For this tutorial, the Simple Storage Service (S3), as well as Identity and
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Access Management (IAM) are relevant.
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Creating the bucket
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-------------------
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First, a bucket to store your backups in must be created. Using the "Services"
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menu, navigate to S3. In case you already have some S3 buckets, you will see a
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list of them here:
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.. image:: images/aws_s3/03_buckets_list_before.png
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:alt: List of S3 Buckets
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Click the "Create bucket" button and choose a name and region for your new
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bucket. For the purpose of this tutorial, the bucket will be named
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``restic-demo`` and reside in Frankfurt. Because the bucket name space is
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shared among all AWS users, the name ``restic-demo`` may not be available to
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you. Be creative and choose a unique bucket name.
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.. image:: images/aws_s3/04_bucket_create_start.png
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:alt: Create a Bucket
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It is not necessary to configure any special properties or permissions of the
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bucket just yet. Therefore, just finish the wizard without making any further
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changes:
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.. image:: images/aws_s3/05_bucket_create_review.png
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:alt: Review Bucket Creation
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The newly created ``restic-demo`` bucket will now appear on the list of S3
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buckets:
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.. image:: images/aws_s3/06_buckets_list_after.png
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:alt: List With New Bucket
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Creating a user
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---------------
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Use the "Services" menu of the AWS web interface to navigate to IAM. This will
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bring you to the IAM homepage. To create a new user, click on the "Users" menu
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entry on the left:
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.. image:: images/aws_s3/07_iam_start.png
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:alt: IAM Home Page
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In case you already have set-up users with IAM before, you will see a list of
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them here. Use the "Add user" button at the top to create a new user:
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.. image:: images/aws_s3/08_user_list.png
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:alt: IAM User List
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For this tutorial, the new user will be named ``restic-demo-user``. Feel free to
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choose your own name that best fits your needs. This user will only ever access
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AWS through the ``restic`` program and not through the web interface. Therefore,
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"Programmatic access" is selected for "Access type":
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.. image:: images/aws_s3/09_user_name.png
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:alt: Choose User Name and Access Type
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During the next step, permissions can be assigned to the new user. To use this
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user with restic, it only needs access to the ``restic-demo`` bucket. Select
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"Attach existing policies directly", which will bring up a list of pre-defined
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policies below. Afterwards, click the "Create policy" button to create a custom
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policy:
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.. image:: images/aws_s3/10_user_pre_policy.png
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:alt: Assign a Policy
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A new browser window or tab will open with the policy wizard. In Amazon IAM,
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policies are defined as JSON documents. For this tutorial, the "Policy
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Generator" will be used to generate a policy file using a web interface:
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.. image:: images/aws_s3/11_policy_start.png
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:alt: Create a New Policy
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After invoking the policy generator, you will be presented with a user
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interface to generate individual permission statements. For restic to work, two
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such statements must be created. The first statement is set up as follows:
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.. code::
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Effect: Allow
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Service: Amazon S3
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Actions: DeleteObject, GetObject, PutObject
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Resource: arn:aws:s3:::restic-demo/*
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This statement allows restic to create, read and delete objects inside the S3
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bucket named ``restic-demo``. Adjust the bucket's name to the name of the bucket
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you created earlier. Using the "Add Statement" button, this statement can be
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saved. Now a second statement is created:
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.. code::
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Effect: Allow
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Service: Amazon S3
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Actions: ListBucket
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Resource: arn:aws:s3:::restic-demo
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Again, substitute ``restic-demo`` with the actual name of your bucket. Note that,
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unlike before, there is no ``/*`` after the bucket name. This statement allows
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restic to list the objects stored in the ``restic-demo`` bucket. Again, use "Add
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Statement" to save this statement. The policy creator interface should now
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look as follows:
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.. image:: images/aws_s3/12_policy_permissions_done.png
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:alt: Policy Creator With Two Statements
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Continue to the next step and enter a name and description for this policy. For
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this tutorial, the policy will be named ``restic-demo-policy``. In this step you
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can also examine the JSON document created by the policy generator. Click
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"Create Policy" to finish the process:
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.. image:: images/aws_s3/13_policy_review.png
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:alt: Policy Review
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Go back to the browser window or tab where you were previously creating the new
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user. Click the button labeled "Refresh" above the list of policies to make
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sure the newly created policy is available to you. Afterwards, use the search
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function to search for the ``restic-demo-policy``. Select this policy using the
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checkbox on the left. Then, continue to the next step.
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.. image:: images/aws_s3/14_user_attach_policy.png
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:alt: Attach Policy to User
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The next page will present an overview of the user account that is about to be
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created. If everything looks good, click "Create user" to complete the process:
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.. image:: images/aws_s3/15_user_review.png
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:alt: User Creation Review
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After the user has been created, its access credentials will be displayed. They
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consist of the "Access key ID" (think user name), and the "Secret access key"
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(think password). Copy these down to a safe place.
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.. image:: images/aws_s3/16_user_created.png
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:alt: User Credentials
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You have now completed the configuration in AWS. Feel free to close your web
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browser now.
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Initializing the restic repository
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----------------------------------
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Open a terminal and make sure you have the ``restic`` binary ready. First, choose
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a password to encrypt your backups with. In this tutorial, ``apg`` is used for
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this purpose:
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.. code-block:: console
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$ apg -a 1 -m 32 -n 1 -M NCL
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I9n7G7G0ZpDWA3GOcJbIuwQCGvGUBkU5
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Note this password somewhere safe along with your AWS credentials. Next, the
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configuration of restic will be placed into environment variables. This will
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include sensitive information, such as your AWS secret and repository password.
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Therefore, make sure the next commands **do not** end up in your shell's
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history file. Adjust the contents of the environment variables to fit your
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bucket's name and your user's API credentials.
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.. code-block:: console
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$ unset HISTFILE
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$ export RESTIC_REPOSITORY="s3:https://s3.amazonaws.com/restic-demo"
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$ export AWS_ACCESS_KEY_ID="AKIAJAJSLTZCAZ4SRI5Q"
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$ export AWS_SECRET_ACCESS_KEY="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"
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$ export RESTIC_PASSWORD="I9n7G7G0ZpDWA3GOcJbIuwQCGvGUBkU5"
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After the environment is set up, restic may be called to initialize the
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repository:
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.. code-block:: console
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$ ./restic init
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created restic backend b5c661a86a at s3:https://s3.amazonaws.com/restic-demo
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Please note that knowledge of your password is required to access
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the repository. Losing your password means that your data is
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irrecoverably lost.
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restic is now ready to be used with AWS S3. Try to create a backup:
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.. code-block:: console
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$ dd if=/dev/urandom bs=1M count=10 of=test.bin
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10+0 records in
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10+0 records out
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10485760 bytes (10 MB, 10 MiB) copied, 0,0891322 s, 118 MB/s
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$ ./restic backup test.bin
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scan [/home/philip/restic-demo/test.bin]
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scanned 0 directories, 1 files in 0:00
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[0:04] 100.00% 2.500 MiB/s 10.000 MiB / 10.000 MiB 1 / 1 items ... ETA 0:00
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duration: 0:04, 2.47MiB/s
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snapshot 10fdbace saved
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$ ./restic snapshots
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ID Date Host Tags Directory
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----------------------------------------------------------------------
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10fdbace 2017-03-26 16:41:50 blackbox /home/philip/restic-demo/test.bin
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A snapshot was created and stored in the S3 bucket. This snapshot may now be
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restored:
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.. code-block:: console
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$ mkdir restore
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$ ./restic restore 10fdbace --target restore
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restoring <Snapshot 10fdbace of [/home/philip/restic-demo/test.bin] at 2017-03-26 16:41:50.201418102 +0200 CEST by philip@blackbox> to restore
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$ ls restore/
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test.bin
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The snapshot was successfully restored. This concludes the tutorial.
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