Basically I want to auto synch all media from the PB to PC using Desktop. (I'd use auto backup just for settings & apps.) Then periodically delete media files from the PB but keep each everything on the PC forever.
But I don't want the Desktop to re-synch files from the PC back to the PB.
It may be me but I've never felt sync to work very well either. I prefer manual although that can be tedious having to follow up on both ends to make sure you have everything you want. But I've had poor luck with auto-sync. I remove some file (music, photo, doc) on one end (say, pb) because I don't need it there anymore and sync either now wants to put it back on the pb or remove it from the computer side so that neither pb nor computer has it. NO! I want my original computer copy. I just don't want it on the pb (or laptop or bbphone or mp3 player).