I ran into an issue with backuppc (Debian/sid, last upgraded 4/27/12),
and I'm trying to figure out what the problem is. Nagios alerted today
that the /var/lib/backuppc (500GB) filesystem was critical. I logged
in and found the following:

/dev/mapper/vg00-backuppc ext4 523733076 496248972   1269704 100%
/var/lib/backuppc

However, I can't reconcile those numbers with the numbers backuppc is
showing. My 4-week graph shows the following for the cpool:

Current 331.94GB Average 328.61GB Max 337.15GB

The stats also say

Nightly cleanup removed 0 files of size 0.00GB (around 5/29 01:00),

I have not added any machines or had any huge additions of files, but
also notice that backups haven't run in 2 days, presumably because of
the full filesystem.

I added 100GB to that filesystem, but would really like to reconcile
where the space went, and at some point, would like to stick that
spare 100GB back in reserve until I need it. (I know, some would say
I need it now, but I can think of no reason for the filesystem to
mushroom like that.)

So where might the space have gone (given that the backup landscape
hasn't changed)? Could something have kept the nightlies from running
and deleting old backups, which then accumulated?

Thanks,
--b

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