[Gandalf Parker]

I generally use pre.sh and post.sh

Also I think you want --preexec rather than --postexec

Once the game hosts, saving a copy is not much use since it will match the game itself. Players will complain about the hosting results in which case you want to be able to return to the files prior to hosting.

By the way, I find it more useful in many many ways to do
nice zip -9 game.zip * -x *game.zip -x z*
and then attach it to a email going to an address off-system.
That provides:
A) backup
B) dated multiple backups allowing restore to multiple points
C) security in case of system crashes or hard drive failures
D) ease of forwarding the latest games files to someone else in case they volunteer to pick up running the game for some reason