Comment 27 for bug 679917

Proposal for windows filenames:

* Autosave

Save in c:\Documents and Profiles\Usersname\Local Settings\Application Data\hugin or c:\Users\Usersname\Local Settings\Application Data\hugin (depending on version). On Linux this could be Home/.hugin; but not sure about MacOS.
Filename is random and unique
Automatic deletion when closing hugin
Provide automatic loading of autosave file

* Backup
in the same folder as project file
On saving file rename file on disc to filename_date_time.pto
Save current state under filename.pto
User is responsible for cleanup