You don't have to concern about IOS backup. IOS image is stored on the flash and is decompressed and loaded from the scratch every time you restart your appliance. Running configuration is the only thing you should backup
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...