After running e-smith for almost a year, I have decided I need to start cosidering doing backups

. I've been reading the threads, and I am going to try setting up a cdr burner and backup that way. One question I have is: Is there a way to exclude specific ibays from the backup? I have a couple of user forums on my system, and a large file sharing ibay, that don't need to be backed up on a normal schedule. Plus they are huge. If I can exclude them, I am sure I can fit the entire backup on a single cd. Is there a flag I can set, or a file marker, to exclude specific directories?
I have these ibays actually on another physical disk, so I could do a umount before I back up, but I thought I would try to find another way.
rk