Create DB backup option

[Moltensnor]

Create option to automate database backups and create one that can be imported on database data loss.

[rensPols]

I think this will be an excellent addition to exDock, but it isn't necessary for the initial release. Therefore, I've modified the milestone to "Beta release".

It is perfectly fine to already start working on this, but this is not a requirement for the completing of the initial release milestone