PEL is an abbreviation that can mean multiple things. On the developer's website there is nothing mentioned about this, so to find out more, I suggest to contact the developer.
Regarding your second problem, the Bogart's Video Store application comes with a backup and restore option. However, this is not automated and needs to be set up before you can use it. If you didn't set this up before losing your data, there is no chance to perform a recovery.