Backup the file upon closing.

[Amazone]

This is something Microsoft Money does. Each time you close the file it saves the file but also makes a copy on another location (to specify).
This copy is overwritten each time.
Maybe it would be even better to not overwrite but clean up the copies if the total exceeds a specified number.
At the moment I do it manually but it happens that I forget.

[Campbell]

Thanks. Yes, I've been meaning to do this, it's on my list. I will try to do it soon.