I have about 20 backups of my Blazers' dynasty, and about that many of my Bobcats' dynasty....provided my whole HDD doesn't get wiped, I'm fine for most dynasty problems....
1. Only use DBCommander to dbf edit
2. NBA Live '06 is a lot more sensitive to dbf editing. Be very careful trading players or deleting players through dbf. Best to do it in-dynasty if possible. If you trade one of your own players in dbf then you have to remember that in Live '06, there are 2 player ID files for your team's players....one normal one, & one that I think has something to do with evolution
3. Do not install too many patches, & make sure the patchmaker's work is trusty & won't screw you up. If you can live without some stupid new facial hair for Kobe then please do.
4. Backup regularly