My rule number 1 is: “If you don’t have two copies of a file on different devices you don’t have that file!” Here are some programs to help you to that end.
PC only
Unlimited storage for one computer.
Easy install! My Documents and Desktop set to backup automatically. Right-click to select other items to backup.
$49.95 per year for the first computer.
Puts a virtual harddrive on your computer using Amazon’s S3 service.
$0.15 per GB-Month of storage used
Data Transfer
$0.10 per GB of data uploaded
$0.17 per GB of data downloaded
Much harder to configure than Carbonite.
Puts a virtual harddrive on your computer that save your backed-up data to a GMail account.
The downside of GMail Drive is that it is only 7GB. The upside is it’s free!