.. Normally, there are no heading levels assigned to certain characters as the structure is determined from the succession of headings. However, this convention is used in Python’s Style Guide for documenting which you may follow: # with overline, for parts * for chapters = for sections - for subsections ^ for subsubsections " for paragraphs ########## Backing up ########## Now we're ready to backup some data. The contents of a directory at a specific point in time is called a "snapshot" in restic. Run the following command and enter the repository password you chose above again: .. code-block:: console $ restic -r /tmp/backup backup ~/work enter password for repository: scan [/home/user/work] scanned 764 directories, 1816 files in 0:00 [0:29] 100.00% 54.732 MiB/s 1.582 GiB / 1.582 GiB 2580 / 2580 items 0 errors ETA 0:00 duration: 0:29, 54.47MiB/s snapshot 40dc1520 saved As you can see, restic created a backup of the directory and was pretty fast! The specific snapshot just created is identified by a sequence of hexadecimal characters, ``40dc1520`` in this case. If you run the command again, restic will create another snapshot of your data, but this time it's even faster. This is de-duplication at work! .. code-block:: console $ restic -r /tmp/backup backup ~/work enter password for repository: using parent snapshot 40dc1520aa6a07b7b3ae561786770a01951245d2367241e71e9485f18ae8228c scan [/home/user/work] scanned 764 directories, 1816 files in 0:00 [0:00] 100.00% 0B/s 1.582 GiB / 1.582 GiB 2580 / 2580 items 0 errors ETA 0:00 duration: 0:00, 6572.38MiB/s snapshot 79766175 saved You can even backup individual files in the same repository. .. code-block:: console $ restic -r /tmp/backup backup ~/work.txt scan [/home/user/work.txt] scanned 0 directories, 1 files in 0:00 [0:00] 100.00% 0B/s 220B / 220B 1 / 1 items 0 errors ETA 0:00 duration: 0:00, 0.03MiB/s snapshot 31f7bd63 saved In fact several hosts may use the same repository to backup directories and files leading to a greater de-duplication. Please be aware that when you backup different directories (or the directories to be saved have a variable name component like a time/date), restic always needs to read all files and only afterwards can compute which parts of the files need to be saved. When you backup the same directory again (maybe with new or changed files) restic will find the old snapshot in the repo and by default only reads those files that are new or have been modified since the last snapshot. This is decided based on the modify date of the file in the file system. Now is a good time to run ``restic check`` to verify that all data is properly stored in the repository. You should run this command regularly to make sure the internal structure of the repository is free of errors. You can exclude folders and files by specifying exclude-patterns. Either specify them with multiple ``--exclude``'s or one ``--exclude-file`` .. code-block:: console $ cat exclude # exclude go-files *.go # exclude foo/x/y/z/bar foo/x/bar foo/bar foo/**/bar $ restic -r /tmp/backup backup ~/work --exclude=*.c --exclude-file=exclude Patterns use `filepath.Glob `__ internally, see `filepath.Match `__ for syntax. Additionally ``**`` excludes arbitrary subdirectories. Environment-variables in exclude-files are expanded with `os.ExpandEnv `__. By specifying the option ``--one-file-system`` you can instruct restic to only backup files from the file systems the initially specified files or directories reside on. For example, calling restic like this won't backup ``/sys`` or ``/dev`` on a Linux system: .. code-block:: console $ restic -r /tmp/backup backup --one-file-system / By using the ``--files-from`` option you can read the files you want to backup from a file. This is especially useful if a lot of files have to be backed up that are not in the same folder or are maybe pre-filtered by other software. or example maybe you want to backup files that have a certain filename in them: .. code-block:: console $ find /tmp/somefiles | grep 'PATTERN' > /tmp/files_to_backup You can then use restic to backup the filtered files: .. code-block:: console $ restic -r /tmp/backup backup --files-from /tmp/files_to_backup Incidentally you can also combine ``--files-from`` with the normal files args: .. code-block:: console $ restic -r /tmp/backup backup --files-from /tmp/files_to_backup /tmp/some_additional_file Comparing Snapshots ******************* Restic has a `diff` command which shows the difference between two snapshots and displays a small statistic, just pass the command two snapshot IDs: .. code-block:: console $ restic -r /tmp/backup diff 5845b002 2ab627a6 password is correct comparing snapshot ea657ce5 to 2ab627a6: C /restic/cmd_diff.go + /restic/foo C /restic/restic Files: 0 new, 0 removed, 2 changed Dirs: 1 new, 0 removed Others: 0 new, 0 removed Data Blobs: 14 new, 15 removed Tree Blobs: 2 new, 1 removed Added: 16.403 MiB Removed: 16.402 MiB Backing up special items and metadata ************************************* **Symlinks** are archived as symlinks, ``restic`` does not follow them. When you restore, you get the same symlink again, with the same link target and the same timestamps. If there is a **bind-mount** below a directory that is to be saved, restic descends into it. **Device files** are saved and restored as device files. This means that e.g. ``/dev/sda`` is archived as a block device file and restored as such. This also means that the content of the corresponding disk is not read, at least not from the device file. By default, restic does not save the access time (atime) for any files or other items, since it is not possible to reliably disable updating the access time by restic itself. This means that for each new backup a lot of metadata is written, and the next backup needs to write new metadata again. If you really want to save the access time for files and directories, you can pass the ``--with-atime`` option to the ``backup`` command. Reading data from stdin *********************** Sometimes it can be nice to directly save the output of a program, e.g. ``mysqldump`` so that the SQL can later be restored. Restic supports this mode of operation, just supply the option ``--stdin`` to the ``backup`` command like this: .. code-block:: console $ mysqldump [...] | restic -r /tmp/backup backup --stdin This creates a new snapshot of the output of ``mysqldump``. You can then use e.g. the fuse mounting option (see below) to mount the repository and read the file. By default, the file name ``stdin`` is used, a different name can be specified with ``--stdin-filename``, e.g. like this: .. code-block:: console $ mysqldump [...] | restic -r /tmp/backup backup --stdin --stdin-filename production.sql Tags for backup *************** Snapshots can have one or more tags, short strings which add identifying information. Just specify the tags for a snapshot one by one with ``--tag``: .. code-block:: console $ restic -r /tmp/backup backup --tag projectX --tag foo --tag bar ~/work [...] The tags can later be used to keep (or forget) snapshots with the ``forget`` command. The command ``tag`` can be used to modify tags on an existing snapshot.