This white paper by WebAmphibian.Com explains why many 'mom and pop' shops need backups.
After assisting a number of customers in setting up a backup
system (hardware, software, phylosophy, and practice), the same
questions kept coming up.
What kind of backups are right for me?
How often do I need to backup?
...etc...
This white paper attempts to cover the broad spectrum of backup
needs with a mind towards both the cost and probablity that a
given type of backups will actually occur once we leave the
premisis.