Okay. Still not sure to see the backward compatibily issue (looks easier to migrate old settings to fit the new backup system) but I trust you.
Don’t forget the documentation.
Remember we already share some thoughts about this :
We could also use some Lucene on the fly indexing if we really want the UI be super responsive instead of building a file list when loading the UI page. I’m not sure it’s worth the trouble : someone wanting to restore some files will easily accept to wait some seconds when the list of files is being built.