you could do it in your app terminate routine by having something like "copyfile <yourdatabase> backuppath & "Backup.mdb"
ie
assuming your database is in the app directiry, and you want to save it to a backup directory on the "c:" drive
if len(trim(dir("C:\backup.mdb)) > 0 then kill "C:\backup.mdb" 'there are several ways of checking for an existing file - this is just one
copyfile app.path & data.mdb "C:\backup" & data.mdb
(I think it's copyfile, it may be filecopy)