I have been using backuppc 2.1.2 for a number of years to back up a Linux
web server (rsync 2.6.9) to a local server (also running rsync 2.6.9). My
recollection was that the amount of data transferred by backuppc was quite
low (around 40MB) regardless of whether I was doing a full backup or an
incremental backup.
In late February, I built a new backup server running backuppc 3.1.0 and
rsync 3.0.5. Over the last month, I have been migrating the Linux web
server from a shared hosting environment to a virtual private server
running rsync 2.6.8. I recently have been tracking bandwidth due to ISP
caps. This morning's backups appear to have download about 230MB to the
local server and uploaded about 10MB.
Going over the logs, I see 4 incremental backups totalling 116 existing
files (3MB) and 207 new files (24MB). I started one full backup on the
old shared hosting server that failed after 18 minutes with "Aborting
backup up after signal PIPE". A partial dump was saved. Another attempt
was made the next hour and completed after 4 minutes with 1752 existing
files (123MB) and 7 new files (6MB).
Clearly, a lot of things have changed, including a large increase in the
number of system files that backuppc needs to check. How much of the
240MB of backup traffic could be attributed to transferring control
information? My reading the documentation suggests that rsync only
transfers changed blocks even on a full backup, so that data portion of
the backup should be at most 30GB. Could the mismatch in rsync levels
be causing issues? The VPS server that I am backing up is running CentOS
and 2.6.8 is the most current rsync available on the standard
repositories.
Any suggestions would be greatly appreciated!
Thanks, Norbert------------------------------------------------------------------------------
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