Mark writes:

> Using rsync between two linux servers, the full took 2.5 hours, the
> incremental backups are taking longer each day.
> 
> 2008-10-21 23:00:01 full backup started for directory /
> 2008-10-22 02:32:55 full backup 0 complete, 294903 files, 203401100538
> bytes, 28 xferErrs (0 bad files, 0 bad shares, 28 other)
> 2008-10-22 23:00:00 incr backup started back to 2008-10-21 23:00:01
> (backup #0) for directory /
> 2008-10-23 04:59:40 incr backup 1 complete, 541 files, 170443233887
> bytes, 11 xferErrs (0 bad files, 0 bad shares, 11 other)

Each incremental is transferring 170GB.  The full is 203GB.  Do you
have, eg, a large sparse file below /var/log that you should exclude
from the backup?

Les Mikesell notes that:

    In particular, many 64-bit linux versions have a /var/log/lastlog
    file that appears to be 1.2 terabytes in size as an artifact of
    indexing it by uid numbers and using -1 for the nfsnobody id.  It's
    generally not important to back this file up, so if that is the
    problem you can just exclude

If there is a small change to such a file it is quite likely to be
more expensive than the original complete transfer.  (It won't matter
whether it is a full or incr.)

Craig

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