ToME: the Tales of Maj'Eyal

Perusing through the forums, I did see a bit of info on a hidden file for backing up your character so you can restore in the event of crash / death. Does anyone have a set of instructions as to what specific file(s) need to be backed up to restore?
I have to say i'm encountering a fair amount of stability issues. Most seem attributed to the system being busy doing other things, which causes the Tome app to lag a bit and it doesn't seem to recover. I'm trying to put my finger on any coincidences for the dev forum, but nothing comes to mind yet.

On windows it defaults to C:\Documents and Settings\UserName\T-Engine\4.0\tome\save

Charlatan73, whenever I mention stability issues, I usually get told to run tome in gdb and give dg a stack trace. http://doku.t-o-m-e.net/tome4:running_tome_with_gdb