According to what I have been told it is not possible to restore the config of the MARS appliance minus the old incidents. In fact, you cannot delete incidents at all because it would corrupt the SQL database. Once a rule is created it can only be deactivated and can never be deleted. You would have to erase the MARS appliance completely and rebuild it to have old events removed.
The only documentation regarding backups is that I am aware of is on CCO.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...