Difference between revisions of "Backup with Affa and FreeDup"
(New page: === Purpose === There are situations in backup process that Affa (with or without Rsync) can't handle well. Imagine backing up user files in a company where documents are distributed on r...) |
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| + | === Version === | ||
| + | {{ #smeversion: freedup}} | ||
| + | |||
=== Purpose === | === Purpose === | ||
| − | There are situations in backup process that Affa (with or without Rsync) can't handle well. | + | There are situations in backup process that [[Affa]] (with or without Rsync) can't handle well. |
Imagine backing up user files in a company where documents are distributed on regular basis. It is very likely that all of your users will have a copy of the same file in their documents. | Imagine backing up user files in a company where documents are distributed on regular basis. It is very likely that all of your users will have a copy of the same file in their documents. | ||
| Line 6: | Line 9: | ||
Freedup walks through the file trees (directories) you specify. When it finds two identical files on the same device, it hard links them together. In this case two or more files still exist in their respective directories, but only one copy of the data is stored on disk; both directory entries point to the same data blocks. | Freedup walks through the file trees (directories) you specify. When it finds two identical files on the same device, it hard links them together. In this case two or more files still exist in their respective directories, but only one copy of the data is stored on disk; both directory entries point to the same data blocks. | ||
| − | Rsync partially does this, but it won't search for identical files within your backup. This software does just that. | + | Rsync partially does this, but it won't search for identical files within your backup. This software does just that. |
| − | |||
| − | |||
This document describes the installation and configuration options of the freedup in Affa's post job for the purpose to reclaim free space on your disk occupied by duplicate files. | This document describes the installation and configuration options of the freedup in Affa's post job for the purpose to reclaim free space on your disk occupied by duplicate files. | ||
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=== Installation === | === Installation === | ||
| − | |||
| − | + | ====SME10==== | |
| − | + | To install the package issue the following command (development version is in /smedev): | |
| + | yum install freedup --enablerepo=smecontribs | ||
=== Usage === | === Usage === | ||
| − | + | To use FreeDup with Affa, first install and setup latest version of Affa. Installation instructions for Affa can be found [[:Affa | here]]. | |
| − | To use FreeDup with Affa, first install and setup latest version of Affa. | ||
Then add this | Then add this | ||
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=== Various Tests === | === Various Tests === | ||
| − | |||
To see how much your backup occupies, you may find these commands below useful. | To see how much your backup occupies, you may find these commands below useful. | ||
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find <insert your directory with backups> -xdev -type f -links +1 -printf '%i %p\n' | sort -n > links.txt | find <insert your directory with backups> -xdev -type f -links +1 -printf '%i %p\n' | sort -n > links.txt | ||
| + | {{Note box|msg=Please be aware that once you launch FreeDup, it can take several hours to complete, depending on the size of backups as it its algorithm is making sure that files that are to be hardlinked are the same. }} | ||
| + | |||
| + | {{Note box|Also, make sure you have the latest version of Affa installed. At the time of writing this document, it was Affa 1.0.0-2.}} | ||
| + | |||
| + | ===User experience=== | ||
| + | In my case I saved ONE THIRD of the backup diskspace on one single backup alone. And what is more, FreeDup found more identical files within backups' trees themselves, hence correcting Rsync and saving me terabytes of space. | ||
| + | |||
| + | Without FreeDup's hardlinks my current off-site backup would be 3.4TB, but instead it is only 270MB. That is 12 backups in total - 3x monthly, 4x weekly and 5x daily backups + the current backup running. - [[User:Giskaard | Giskaard]] ([[User_talk:Giskaard|talk]] | [[ Special:Contributions/Giskaard| contribs]]) | ||
| + | |||
| + | === References === | ||
| + | * Wikipedia article http://en.wikipedia.org/wiki/Freedup | ||
| + | * FreeDup homepage http://freedup.org | ||
| + | * Wiki article [[Affa]] | ||
| + | |||
| + | ===Bug report=== | ||
| + | Freedup is listed in the [http://bugs.contribs.org/enter_bug.cgi?product=SME%20Contribs&component=freedup bugtracker contribs section]. | ||
| + | Please report all bugs, new feature requests and documentation issues there. | ||
| − | |||
| − | + | {{#bugzilla:columns=id,product,version,status,summary |sort=id |order=desc |disablecache=1|component=freedup|noresultsmessage="No open bugs found."}} | |
| − | |||
| − | + | ---- | |
| + | [[Category:Contrib]] | ||
| + | [[Category:Backup]] | ||
Latest revision as of 00:34, 30 September 2021
Version
Purpose
There are situations in backup process that Affa (with or without Rsync) can't handle well.
Imagine backing up user files in a company where documents are distributed on regular basis. It is very likely that all of your users will have a copy of the same file in their documents.
Freedup walks through the file trees (directories) you specify. When it finds two identical files on the same device, it hard links them together. In this case two or more files still exist in their respective directories, but only one copy of the data is stored on disk; both directory entries point to the same data blocks.
Rsync partially does this, but it won't search for identical files within your backup. This software does just that.
This document describes the installation and configuration options of the freedup in Affa's post job for the purpose to reclaim free space on your disk occupied by duplicate files.
Installation
SME10
To install the package issue the following command (development version is in /smedev):
yum install freedup --enablerepo=smecontribs
Usage
To use FreeDup with Affa, first install and setup latest version of Affa. Installation instructions for Affa can be found here.
Then add this
freedup -Tv <insert your directory with backups>
into
/usr/lib/affa/postJob.sh
Command line options are beyond the scope of this document, in my case I only use -T to preserve timestamps and -v for some verbosity.
Various Tests
To see how much your backup occupies, you may find these commands below useful.
Find out real, physical space occupied by your backup:
du -sh <insert your directory with backups>
Find out the space occupied by your backup if you weren't using hardlinks (counts sizes many times if hard linked):
du -shl <insert your directory with backups>
Find out what files are hardlinked:
find <insert your directory with backups> -xdev -type f -links +1 -printf '%i %p\n' | sort -n > links.txt
User experience
In my case I saved ONE THIRD of the backup diskspace on one single backup alone. And what is more, FreeDup found more identical files within backups' trees themselves, hence correcting Rsync and saving me terabytes of space.
Without FreeDup's hardlinks my current off-site backup would be 3.4TB, but instead it is only 270MB. That is 12 backups in total - 3x monthly, 4x weekly and 5x daily backups + the current backup running. - Giskaard (talk | contribs)
References
- Wikipedia article http://en.wikipedia.org/wiki/Freedup
- FreeDup homepage http://freedup.org
- Wiki article Affa
Bug report
Freedup is listed in the bugtracker contribs section. Please report all bugs, new feature requests and documentation issues there.
