[BackupPC-users] Only Backup last 7 days? (rsyncd)

[B. C. <bc...@po...>]

I have a Win2k3 server with Delta Copy running on it.

There is an automated task that dumps the sql db located on that  
machine to a file:

rsync -avz caass::MSSql

receiving file list ... done
drwx------           0 2008/08/26 02:00:01 .
-rwx------   519455232 2008/08/22 02:00:25 CAASS8_db_200808220200.BAK
-rwx------   519505408 2008/08/23 02:00:22 CAASS8_db_200808230200.BAK
-rwx------   519462400 2008/08/24 02:00:20 CAASS8_db_200808240200.BAK
-rwx------   519505408 2008/08/25 02:00:26 CAASS8_db_200808250200.BAK
-rwx------   519456256 2008/08/26 02:00:25 CAASS8_db_200808260200.BAK

These seem to compress down to a about 135M (with bzip2)

Is there someway that I could only keep the last 7 or so of these?   
Should I compress them on the server first?.. etc.

afict there is something with mtime and --files-from, but they all  
look like it's running that command on the rsyncd server, which in  
this case is Win2k3.

Any suggestions?