A simple way would be to exclude the log files from backup, and have a
preschedule command run that copies the log files someplace else or to
another filename and let the backup process back those up instead. E.g.
something like:

Dsm.sys:

Postschedulecmd "cp /path/to/logs/* /path/to/logs/backup/"

Exclude /path/to/logs/*


Gerald Wichmann
Sr. Systems Development Engineer
Zantaz, Inc.
650.625.0436 home
408.836.9062 cell