Backing up the PAF database has little value if you don't also keep a backup of the runtime environment.
It has been a little while since I have used PAF but I use to travel with the software running on a flash drive and before that running off a CD-ROM and floppy. I would install the entire application and database on a thumb or ROM drive with all electronic documentation and store it away in your safe place.
You should also export a GEDCOM and store safe as well.