Add ability to filter on tag / hostname

[extera-nl]

I backup to the same repo from multiple host / servers, I use tags to separate them.

At the moment, to my knowledge, it is not possible to either:

• add a tag / hostname filter from within the repository view
• add a tag / hostname when adding the repo

I think both would be great additions, so you can either add the 1 repo once, and filter in the repo screen, or add the same repo multiple times using hostname / tags to filter on