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Re: [rdiff-backup-users] Backing up a restore doubled rdiff-backup size


From: Ben Escoto
Subject: Re: [rdiff-backup-users] Backing up a restore doubled rdiff-backup size
Date: Tue, 20 Dec 2005 21:12:47 -0600

>>>>> Blair Zajac <address@hidden>
>>>>> wrote the following on Mon, 19 Dec 2005 23:00:42 -0800
> I use rdiff-backup to backup my wife's PowerBook's /Users/*
> directories and this weekend I upgraded it from 10.3 to 10.4 by
> doing the following steps:
> 
> 1) Attach external Firewire drive.
> 2) Clone internal disk to external using Carbon Copy Cloner.
> 3) Wipe internal disk.
> 4) Install 10.4.
> 5) Drag and drop directories from external disk back into internal disk.
...
> 
> So I was surprised when I got this report today.  I would assume
> that the diffs would be 0 size, so the incremental size of the
> repository would be very small, not almost a doubling of the size.
...
> $ cat session_statistics.2005-12-18T22:48:07-08:00.data
> StartTime 1134974887.00 (Sun Dec 18 22:48:07 2005)
> EndTime 1135021621.73 (Mon Dec 19 11:47:01 2005)
> ElapsedTime 46734.57 (12 hours 58 minutes 54.57 seconds)
> SourceFiles 71151
> SourceFileSize 24738960103 (23.0 GB)
> MirrorFiles 78164
> MirrorFileSize 55819067916 (52.0 GB)
> NewFiles 14191
> NewFileSize 934670526 (891 MB)
> DeletedFiles 21204
> DeletedFileSize 31778439883 (29.6 GB)
> ChangedFiles 56575
> ChangedSourceSize 23804289577 (22.2 GB)
> ChangedMirrorSize 24040628033 (22.4 GB)
> IncrementFiles 91970
> IncrementFileSize 23232724461 (21.6 GB)
> TotalDestinationSizeChange -7847383352 (-7.31 GB)
> Errors 0
> 
> I didn't restore a lof of the data that applications leave around,
> such as browser cache files and the like, so I can see the -7.31 GB,
> but seeing everything as changed is odd.
> 
> Or am I just mis-reading the information here?

I think the session statistics jive with what you expected.  The
-7.31GB is the net change in the repository.  So after your backup,
the repository 7GB was smaller than when you started.

Since the new version of your directory is only 23GB (compared to 52GB
before), of course a lot of the repository will be dedicated to
storing all those files which no longer exist.  So if you deleted the
information on all those old files, the repository would be only half
as big.  That doesn't mean the size of the repository ever doubled.


-- 
Ben Escoto

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