[Borgbackup] deduplication understanding and best practice?

[Maurice Libes]

hello to all

I guess it is a FAQ but, never mind I have a question as concerning the 
borg deduplication understanding and best practices

Let's say I want to backup several different Linux PC ,
in order to benefit of the blocs deduplication is it better to :

i) make a "all in one" linux borg-repository in which I backup several PC
in the aim of benefit of identical blocs deduplication of many PC
or
ii)  different repositories : one by different PC


many thanks for your advices or links

ML


I made a test, and in case i)  I don't see an apparent benefit when I 
backup a Linux pc "A" into the repository filled by another Linux PC "B"


i) backup of a PC "A" into its own repository :

borg create -v --info --stats 
borg at myborgserver.univ.fr:/mnt/provigo-borg//sauve-pcA/::baklouti-homes-2016-01-17 
/home/

/Time (start): Tue, 2017-01-17 17:31:50/

/Time (end): Tue, 2017-01-17 22:33:38/
/*Duration: 5 hours 1 minutes 47.98 seconds*
//Number of files: 
1384552//------------------------------------------------------------------------------/
/Original size Compressed size Deduplicated size/
/This archive: 334.27 GB 334.34 GB /*222.57 GB*
/All archives: 334.27 GB 334.34 GB 222.57 GB/
/Unique chunks Total chunks/
/Chunk index: 1231378 1469238/


ii) backup of same PC "A" into a "all in one" repository where another 
PC has been already backuped

borg create -v --info --stats 
borg at rancid.mio.univ-amu.fr:/mnt/provigo-borg//sauve-ALLpc/::baklouti-homes-2016-01-17 
/home/



------------------------------------------------------------------------------
Archive name: baklouti-homes-2016-01-17
Time (start): Wed, 2017-01-18 09:43:54
Time (end): Wed, 2017-01-18 14:34:56
*Duration: 4 hours 51 minutes 1.71 seconds*
Number of files: 1384555
------------------------------------------------------------------------------
Original size Compressed size Deduplicated size
This archive: 334.28 GB 334.34 GB /*222.39 GB*/
All archives: 3.52 TB 3.50 TB 487.03 GB
Unique chunks Total chunks
Chunk index: 1651581 8721475


-- 
M. LIBES
Service Informatique OSU Pytheas - UMS 3470 CNRS
Batiment Oceanomed
Campus de Luminy
13288 Marseille cedex 9
Tel: 04860 90529

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