.\" Man page generated from reStructuredText. . . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .TH "SYNCTHING-VERSIONING" "7" "Dec 14, 2024" "v1.28.1" "Syncthing" .SH NAME syncthing-versioning \- Keep automatic backups of deleted files by other nodes .sp Syncthing supports archiving the old version of a file when it is deleted or replaced with a newer version from the cluster. This is called “file versioning” and uses one of the available \fIversioning strategies\fP described below. File versioning is configured per folder, on a per\-device basis, and defaults to “no file versioning”, i.e. no old copies of files are kept. .sp \fBNOTE:\fP .INDENT 0.0 .INDENT 3.5 Versioning applies to changes received \fIfrom other devices\fP\&. That is, if Alice has versioning turned on and Bob changes a file, the old version will be archived on Alice’s computer when that change is synced from Bob. If Alice changes a file locally on her own computer Syncthing will not and can not archive the old version. .UNINDENT .UNINDENT .sp The applicable configuration options for each versioning strategy are described below. For most of them it’s possible to specify where the versions are stored, with the default being the \fB\&.stversions\fP folder inside the shared folder path. If you set a custom version path, please ensure that it’s on the same partition or filesystem as the regular folder path, as moving files there may otherwise fail. .SH TRASH CAN FILE VERSIONING .sp This versioning strategy emulates the common “trash can” approach. When a file is deleted or replaced due to a change on a remote device, it is moved to the trash can in the \fB\&.stversions\fP folder. If a file with the same name was already in the trash can it is replaced. .sp A \fI\%configuration option\fP is available to clean the trash can from files older than a specified number of days. If this is set to a positive number of days, files will be removed when they have been in the trash can that long. Setting this to zero prevents any files from being removed from the trash can automatically. .SH SIMPLE FILE VERSIONING .sp With “Simple File Versioning” files are moved to the \fB\&.stversions\fP folder when replaced or deleted on a remote device. In addition to the \fI\%cleanoutDays\fP option, this strategy also takes a value in an input titled “Keep Versions” which tells Syncthing how many old versions of the file it should \fI\%keep\fP\&. 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 \fB\&.stversions\fP folder on the other devices sharing the same folder. .SH STAGGERED FILE VERSIONING .sp With “Staggered File Versioning” files are also moved to the \fB\&.stversions\fP 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 The following intervals are used and they each have a maximum number of files that will be kept for each. .INDENT 0.0 .TP .B 1 Hour For the first hour, the oldest version in every 30\-seconds interval is kept. .TP .B 1 Day For the first day, the oldest version in every hour is kept. .TP .B 30 Days For the first 30 days, the oldest version in every day is kept. .TP .B Until Maximum Age Until maximum age, the oldest version in every week is kept. .TP .B Maximum Age The maximum time to keep a version in days. For example, to keep replaced or deleted files in the \fB\&.stversions\fP folder for an entire year, use 365. If only for 10 days, use 10. Corresponds to the \fI\%maxAge\fP option. \fBNote: Set to 0 to keep versions forever.\fP .UNINDENT .sp This means that there is only one version in each interval and as files age they will be deleted unless when the interval they are entering is empty. By keeping the oldest versions this versioning scheme preserves the file if it is overwritten. .sp For more info, check the \X'tty: link https://github.com/syncthing/syncthing/blob/main/lib/versioner/staggered_test.go#L32'\fI\%unit test file\fP <\fBhttps://github.com/syncthing/syncthing/blob/main/lib/versioner/staggered_test.go#L32\fP>\X'tty: link' that shows which versions are deleted for a specific run. .SH EXTERNAL FILE VERSIONING .sp This versioning strategy delegates the decision on what to do to an \fI\%external command\fP (e.g. a program or a command line script). Just prior to a file being replaced, the command will be executed. The file needs to be removed from the folder in the process, or otherwise Syncthing will report an error. The command can use the following templated arguments: .INDENT 0.0 .TP .B %FOLDER_PATH% Path to the folder .TP .B %FILE_PATH% Path to the file within the folder .UNINDENT .sp Note that the former expands to the path of the actual Syncthing folder, and the latter to the path inside that folder. For instance, if you use the default \fBSync\fP folder in Windows, and the full path to the file is \fBC:\eUsers\eUser\eSync\eFamily photos\eIMG_2021\-03\-01.jpg\fP, then the \fB%FOLDER_PATH%\fP will be \fBC:\eUsers\eUser\eSync\fP, and the \fB%FILE_PATH%\fP will be \fBFamily photos\eIMG_2021\-03\-01.jpg\fP\&. .SS Example for Unixes .sp Let’s 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): .INDENT 0.0 .INDENT 3.5 .sp .EX #!/bin/sh set \-eu # Where I want my versions stored versionspath=~/.trashcan # The parameters we get from Syncthing folderpath=\(dq$1\(dq filepath=\(dq$2\(dq # First ensure the dir where we need to store the file exists outpath=$(dirname \(dq$versionspath/$filepath\(dq) mkdir \-p \(dq$outpath\(dq # Then move the file there mv \-f \(dq$folderpath/$filepath\(dq \(dq$versionspath/$filepath\(dq .EE .UNINDENT .UNINDENT .sp I must ensure that the script has execute permissions (\fBchmod 755 onlylatest.sh\fP), then configure Syncthing with command \fB/Users/jb/bin/onlylatest.sh %FOLDER_PATH% %FILE_PATH%\fP .sp Let’s 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: .INDENT 0.0 .INDENT 3.5 .sp .EX $ /Users/jb/bin/onlylatest.sh /Users/jb/Sync docs/letter.txt .EE .UNINDENT .UNINDENT .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. .SS Examples for Windows .SS Move to a given folder using the command prompt (CMD) .sp On Windows we can use a batch script to perform the same “trash can”\-like behavior as mentioned above. I created the following script and saved it as \fBC:\eUsers\emfrnd\eScripts\eonlylatest.bat\fP\&. .INDENT 0.0 .INDENT 3.5 .sp .EX @echo off rem Enable UTF\-8 encoding to deal with multilingual folder and file names chcp 65001 rem We need command extensions for md to create intermediate folders in one go setlocal enableextensions rem Where I want my versions stored set \(dqversions_path=%USERPROFILE%\e.trashcan\(dq rem The parameters we get from Syncthing, \(aq~\(aq removes quotes if any set \(dqfolder_path=%~1\(dq set \(dqfile_path=%~2\(dq rem First ensure the dir where we need to store the file exists for %%f in (\(dq%versions_path%\e%file_path%\(dq) do set \(dqoutput_path=%%~dpf\(dq if not exist \(dq%output_path%\(dq md \(dq%output_path%\(dq || exit /b rem Finally move the file, overwrite existing file if any move /y \(dq%folder_path%\e%file_path%\(dq \(dq%versions_path%\e%file_path%\(dq .EE .UNINDENT .UNINDENT .sp Finally, I set \fB\(dqC:\eUsers\emfrnd\eScripts\eonlylatest.bat\(dq \(dq%FOLDER_PATH%\(dq \(dq%FILE_PATH%\(dq\fP as the command name in Syncthing. .SS Move to the Recycle Bin using PowerShell .sp We can use PowerShell to send files directly to the Recycle Bin, which mimics the behaviour of deleting them using the Windows Explorer. Firstly, create the following script and save it in your preferred location, e.g. \fBC:\eUsers\eUser\eScripts\eSendToRecycleBin.ps1\fP\&. .INDENT 0.0 .INDENT 3.5 .sp .EX # PowerShell has no native method to recycle files, so we use Visual # Basic to perform the operation. If succeeded, we also include the # recycled file in the Syncthing\(aqs DEBUG output. Add\-Type \-AssemblyName Microsoft.VisualBasic [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteFile($args,\(aqOnlyErrorDialogs\(aq,\(aqSendToRecycleBin\(aq) if ($?) { Write\-Output (\(dqRecycled \(dq + $args + \(dq.\(dq) } .EE .UNINDENT .UNINDENT .sp Alternatively, the script can be expanded to send only deleted files to the Recycle Bin, and permanently delete modified ones, which makes it more consistent with how the Explorer works. .INDENT 0.0 .INDENT 3.5 .sp .EX # PowerShell has no native method to recycle files, so we use Visual # Basic to perform the operation. Add\-Type \-AssemblyName Microsoft.VisualBasic # We need to test if a Syncthing .tmp file exists. If it does, we assume # a modification and delete the existing file. If if does not, we assume # a deletion and recycle the current file. If succeeded, we also include # the deleted/recycled file in the Syncthing\(aqs DEBUG output. if (Test\-Path \-LiteralPath ((Split\-Path \-Path $args) + \(dq\e~syncthing~\(dq + (Split\-Path \-Path $args \-Leaf) + \(dq.tmp\(dq)) { [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteFile($args,\(aqOnlyErrorDialogs\(aq,\(aqDeletePermanently\(aq) if ($?) { Write\-Output (\(dqDeleted \(dq + $args + \(dq.\(dq) } } else { [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteFile($args,\(aqOnlyErrorDialogs\(aq,\(aqSendToRecycleBin\(aq) if ($?) { Write\-Output (\(dqRecycled \(dq + $args + \(dq.\(dq) } } .EE .UNINDENT .UNINDENT .sp Finally, we set the command name in Syncthing to \fBpowershell.exe \-ExecutionPolicy Bypass \-File \(dqC:\eUsers\eUser\eScripts\eSendToRecycleBin.ps1\(dq \(dq%FOLDER_PATH%\e%FILE_PATH%\(dq\fP\&. .sp The only caveat that you should be aware of is that if your Syncthing folder is located on a portable storage, such as a USB stick, or if you have the Recycle Bin disabled, then the script will end up deleting all files permanently. .SH CONFIGURATION PARAMETER REFERENCE .sp The versioning settings are grouped into their own section of each folder in the \fI\%configuration file\fP\&. The following shows an example of such a section in the XML: .INDENT 0.0 .INDENT 3.5 .sp .EX 3600 basic .EE .UNINDENT .UNINDENT .INDENT 0.0 .TP .B versioning.type Selects one of the versioning strategies: \fBtrashcan\fP, \fBsimple\fP, \fBstaggered\fP, \fBexternal\fP or leave empty to disable versioning completely. .UNINDENT .INDENT 0.0 .TP .B versioning.fsPath Overrides the path where old versions of files are stored and defaults to \fB\&.stversions\fP if left empty. An absolute or relative path can be specified. The latter is interpreted relative to the shared folder path, if the \fI\%fsType\fP is configured as \fBbasic\fP\&. Ignored for the \fBexternal\fP versioning strategy. .sp This option used to be stored under the keys \fBfsPath\fP or \fBversionsPath\fP in the \fI\%params\fP element. .UNINDENT .INDENT 0.0 .TP .B versioning.fsType The internal file system implementation used to access this versions folder. Only applies if \fI\%fsPath\fP is also set non\-empty, otherwise the \fI\%filesystemType\fP from the folder element is used instead. Refer to that option description for possible values. Ignored for the \fBexternal\fP versioning strategy. .sp This option used to be stored under the key \fBfsType\fP in the \fI\%params\fP element. .UNINDENT .INDENT 0.0 .TP .B versioning.cleanupIntervalS The interval, in seconds, for running cleanup in the versions folder. Zero to disable periodic cleaning. Limited to one year (31536000 seconds). Ignored for the \fBexternal\fP versioning strategy. .sp This option used to be stored under the key \fBcleanInterval\fP in the \fI\%params\fP element. .UNINDENT .INDENT 0.0 .TP .B versioning.params Each versioning strategy can have configuration parameters specific to its implementation under this element. .UNINDENT .INDENT 0.0 .TP .B versioning.params.cleanoutDays The number of days to keep files in the versions folder. Zero means to keep forever. Older elements encountered during cleanup are removed. .UNINDENT .INDENT 0.0 .TP .B versioning.params.keep The number of old versions to keep, per file. .UNINDENT .INDENT 0.0 .TP .B versioning.params.maxAge The maximum time to keep a version, in seconds. Zero means to keep forever. .UNINDENT .INDENT 0.0 .TP .B versioning.params.command External command to execute for storing a file version about to be replaced or deleted. If the path to the application contains spaces, it should be quoted. .UNINDENT .SH AUTHOR The Syncthing Authors .SH COPYRIGHT 2014-2019, The Syncthing Authors .\" Generated by docutils manpage writer. .