[BackupPC-users] Daily backup volume

Backuppc v3.1 using rsync

We are trying to measure the amount of changed data per backup run for a
given client machine. What we've done so far is examine the transfer log
for that client, specifically:

BackupPC_zcat /var/lib/backuppc/pc/CLIENT/XferLOG.nnn |
        grep '\W*create'|\
        grep -v '\W*create d'|\
        awk '{totalsize += $4}END{printf("%d\n", totalsize/1024/1024)}'"

In other words, find all lines the XferLOG file that start with 'create'
but do not start with 'create d', and then sum up the size of the
transfers.

Is this a valid mechanism? If a large files has a small change, and thus
rsync only transfers a relatively small percentage of the file, does the
transfer log reflect the size of the transfer or the size of the file in
full?

Thanks,
Keith

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