If you can't find a product below that suits you below, MIT OCW has a course on advanced data structures which covers this, they're know as persistent data stru

If you can't find a product below that suits you below, MIT OCW has a course on advanced data structures which covers this, they're know as persistent data structures, and the lectures on them are very informative. Edit: The lectures: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-851-advanced-data-structures-spring-2012/lecture-videos/ http://ocw.mit.edu/courses/electrical-engineering-and-comput...