Once history has been removed, it is no longer stored. However, in the future there are tools that can be used in order to create backups.

• Back up and restore information in Firefox profiles
• FEBE and add on to back up on a timer

I hope this helps. There have been other methods posted to recover data, but this is not something that is a guarantee: http://www.ehow.com/how_6120440_restore-deleted-history-...

You can't prevent other users from deleting the history. If you want to monitor users (children) or have record of the history of visited websites then you should do that on the OS level with parental control software or with a password protected logging feature in the router.