We recommend that you back up your data at the end of each session. If your hard disk has more than one drive, back up onto a different drive from the one where you keep your working data. If you have only one hard disk drive, back up onto disks.
Tip: The first time you do a daily backup, we suggest that you make several sets of backup disks and label the sets “QuickBooks Backup Monday,” “QuickBooks Backup Tuesday,” and so forth.
Tip: For your monthly backups, you may want to alternate between two sets of disks. If disaster strikes your office, you'll want to have a reliable record of your data to fall back on.