If your backup needs are not too complex -- but you want to do incremental backups
and store in a generic, easy access format (like .zip files), you might do pretty well with
Backup995.
(You can use it for free -- it pops an advert in your browser -- or buy the full version for $9.95. They also have a suite of utilities you can buy as a group or simply DL individually and use for free, ad-driven.)