So Vista keeps your files if you delete them? Intriguing.
Yep. Files only for Home and Basic - no programs.
It's my understanding that Vista, all versions, make incremental file backups, Shadow Copies, from time to time. I think that Home and Basic versions just do the 'Shadow Copy' when it sets a Restore Point, which is at least daily - the other versions may do it more often.
Shadow Explorer, the referenced program, provides a front end to obtain the data that's already there but M$ didn't provide access to on Basic and Home - I guess that the safety of my data isn't important to M$!
This is not a replacement for a proper backup strategy, mainly because the data is on the system drive, but will certainly help when you accidentally overwrite a file.