I have a suggestion for your software. hopefully its work for you.
It is better if when someone want to create a backup, the file name will be "Sticky Passwords (2012-10-28 13:50).pws" instead of "Sticky Passwords.pws". It means that at the end the software add the date and time of backup creation. this is really useful for the people who create backup to make sure. Additionally most of the software which are have important information refer the name like this. because when someone have a bunch of backups, then easily can recognize which one is the last one.