Make backup filename configurable

[nomisge]

This is a feature request:

It would be nice to be able to configure the parts the backup filename is to be made up.
To make sure the names make sense and are unique, it would be good to provide a fixed number of carefully chosen placeholders (shortname, longname, id_numbner , id.. ) to choose from and add a number in case there happens to be more than one course with the same name generated.

I hope, I was able to explain what I mean. If not, let me know and I'll try to fix some examples..