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Re: [rdiff-backup-users] file-by-file changes from one backup to the nex

From: Robert Nichols
Subject: Re: [rdiff-backup-users] file-by-file changes from one backup to the next
Date: Tue, 14 Jun 2011 18:18:25 -0500
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On 06/14/2011 09:08 AM, Henrik wrote:
Hi there,

I've just recently switched backup system from rsnapshot
to rdiff-backup for a part of my data. Mostly because
of the space saved when large files have small changes,
and thus the ability to retain more backups (possibly
going back all the way to the original version of a file
when it first entered the system).

All in all I am happy with rdiff-backup. However I don't
have the same level of confidence that I quickly developed
when starting with rsnapshot.

The main reason is (as I perceive it) the lack of status
output, or maybe the wrong kind of status output.
Or maybe I just haven't found the right combination of
options to get what I need. I am after all pretty new
to rdiff-backup.
[big snip]

You can get a little of that from the file_statistics.{timestamp}.data.gz
file that is created for each backup.  For each file or directory there is
a flag that indicates a change, plus the sizes of the source file, the file
in the mirror, and the increment.  Because of the format and the
possibility of file names with spaces, it gets a bit messy to parse that
file, but the following will show all of the lines with the "change" flag

  zgrep -E '(# F)|(1 [^ ]+ [^ ]+ [^ ]+$)' \
       file_statistcs.{timestamp}.data.gz | less

Alas, if you were using the "--null-separator" option for your backup,
that gets even worse:

  zcat file_statistcs.{timestamp}.data.gz | tr '\0' '\n' | \
       egrep '(# F)|(1 [^ ]+ [^ ]+ [^ ]+$)' | less

Also, you can always see what versions of a file exist in the backup:

  rdiff-backup -l /backup_dir/path/to/some/filename

That's nothing like what you're used to, but at least it's something.

Bob Nichols     "NOSPAM" is really part of my email address.
                Do NOT delete it.

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