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.TH "TODO" "7" "June 07, 2015" "v0.11" "Syncthing"
.SH NAME
Todo \- Keep automatic backups of deleted files by other nodes
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.sp
External versioning needs example for Windows.
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.SH DESCRIPTION
.sp
There are 3 types of File Versioning. When you select each in the web interface,
a short description of each is shown to help you decide.
.SH NO FILE VERSIONING
.sp
This is the default setting. With no file versioning, files that are replaced or
deleted on one device are deleted on other devices that the directory is shared
with. (Note: If a folder is marked "Master Folder" on a device, that device will
not accept changes to the files in the folder, and therefore will not have files
replaced or deleted.)
.SH SIMPLE FILE VERSIONING
.sp
With "Simple File Versioning" files are moved to the ".stversions" folder
(inside your shared folder) when replaced or deleted on a remote device. This
option also takes a value in an input titled "Keep Versions" which tells
Syncthing how many old versions of the file it should keep. For example, if
you set this value to 5, if a file is replaced 5 times on a remote device, you
will see 5 time\-stamped versions on that file in the ".stversions" folder on
the other devices sharing the same folder.
.SH STAGGERED FILE VERSIONING
.sp
With "Staggered File Versioning" files are also moved to a different folder
when replaced or deleted on a remote device (just like "Simple File
Versioning"), however, versions are automatically deleted if they are older
than the maximum age or exceed the number of files allowed in an interval.
.sp
With this versioning method it\(aqs possible to specify where the versions are
stored, with the default being the \fI\&.stversions\fP folder inside the normal
folder path. If you set a custom version path, please ensure that it\(aqs on the
same partition or filesystem as the regular folder path, as moving files there
may otherwise fail. You can use an absolute path (this is recommended) or a
relative path. Relative paths are interpreted relative to Syncthing\(aqs current
or startup directory.
.sp
The following intervals are used and they each have a maximum number of files
that will be kept for each.
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.TP
.B 1 Hour
For the first hour, the most recent version is kept every 30 seconds.
.TP
.B 1 Day
For the first day, the most recent version is kept every hour.
.TP
.B 30 Days
For the first 30 days, the most recent version is kept every day.
.TP
.B Until Maximum Age
The maximum time to keep a version in days. For example, to keep replaced or
deleted files in the ".stversions" folder for an entire year, use 365. If
only or 10 days, use 10. \fBNote: Set to 0 to keep versions forever.\fP
.UNINDENT
.SH EXTERNAL FILE VERSIONING
.sp
This versioning method delegates the decision on what to do to an external
command (program or script). The only configuration option is the name of the
command. This should be an absolute path name. Just prior to a file being
replaced, the command will be run with two parameters: the path to the folder,
and the path to the file within the folder.
.SS Example for Unixes
.sp
Lets say I want to keep the latest version of each file as they are replaced
or removed; essentially I want a "trash can"\-like behavior. For this, I create
the following script and store it as \fB/Users/jb/bin/onlylatest.sh\fP (i.e. the
\fBbin\fP directory in my home directory):
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.nf
.ft C
#!/bin/sh
set \-eu

# Where I want my versions stored
versionspath=~/.trashcan

# The parameters we get from Syncthing
folderpath="$1"
filepath="$2"

# First ensure the dir where we need to store the file exists
mkdir \-p \(gadirname "$versionspath/$filepath"\(ga
# Then move the file there
mv \-f "$folderpath/$filepath" "$versionspath/$filepath"
.ft P
.fi
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.sp
I must ensure that the script has execute permissions (\fBchmod 755
onlylatest.sh\fP), then configure Syncthing with the above path as the command
name.
.sp
Lets assume I have a folder "default" in ~/Sync, and that within that folder
there is a file \fBdocs/letter.txt\fP that is being replaced or deleted. The
script will be called as if I ran this from the command line:
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.sp
.nf
.ft C
$ /Users/jb/bin/onlylatest.sh /Users/jb/Sync docs/letter.txt
.ft P
.fi
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.sp
The script will then move the file in question to
\fB~/.trashcan/docs/letter.txt\fP, replacing any previous version of that letter
that may already have been there.
.SH AUTHOR
The Syncthing Authors
.SH COPYRIGHT
2015, The Syncthing Authors
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