It takes a regular snapshot of your PC and you can rollback to any given time.
Slight issue with XP last night reminded me what a waste of space the built in restore feature is! I've never once managed to use this feature successfully.
This software is about £55, 25% discount through Facebook.....just went on there and found I missed a sale, they were selling licences for $25
http://www.rollbacksoftware.com/
