A few more considerations for you or anyone else when dealing with backups:

1) Always check the backups when possible to ensure they have backed up what you wanted them to backup.
2) If you select incremental backups then make sure you keep all of the incremental sets. An alternative to this is to make full backups once a week and incrementals throughout the week.
3) If you plan on doing this long term make sure the software you choose is (a) paid for (b) has the backing of a major manufacturer and (c) you stick with it. In years to come there's no use going back to a backup set that you can't restore because you can't find the software.
4) Keep your backups safe and secure, preferably out of the house.