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Re: [rdiff-backup-users] Restructuring an archive

From: Dom
Subject: Re: [rdiff-backup-users] Restructuring an archive
Date: Sat, 15 Nov 2008 05:36:13 +0000
User-agent: Internet Messaging Program (IMP) H3 (4.1.3)

Quoting Chris Wilson <address@hidden>:

On Thu, 13 Nov 2008, Dominic wrote:

I'm also curious about the additional overhead (in disk space) that is
created by frequent rdiff-backup runs. If one backs up daily, how much
more disk space is used than if one backs up weekly? In theory no more
because 7 x daily incremental diffs have the same info as 1 x weekly
incremental diff.

I was running a backup of about 150 GB of data three (home directories)
about 3 times a day, and it was taking 8 MB per incremental backup with
rdiff-backup 1.0.5, even if nothing had changed. It may well be less with
more recent versions, due to (1) compressed metadata and (2) incremental
patches to metadata.

Cheers, Chris.

Hi Chris

Thanks for your input. So I reckon that in your case the overhead of having 3x daily as opposed to 1x daily backups is about 4GB per year, which is 3% and so not significant.

In relation to my other question about backing up locked files, my research so far suggests that the solution is to use snapshots: for Linux this means LVM (which fortunately we already use, because our server runs Devil-Linux), and for Windows XP there is a handy utility called vshadow.exe which creates a temporary snapshot which can then be used (I hope) by rdiff-backup.

Cheers, Dominic

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