Multiple Partitions and external devices
I suggest the possibility to syncronize with one drive differents partition and external devices. For example I have: c for windows, D for data, e for music, f for films, g for pictures and so on.. For personal reasons i prefear to have files in different partitions and I'm not able to syncronize or backup more than one partition on one drive. At the moment I'm syncronizing only drive D, less than 10gb because one drive don't allowed me to do others. The others partions are backup on other cloud providers.
Just to add to this. Same idea as above except with drives on external devices. So I could have a mapped drive e, f, g that are on a NAS device. People with larger amounts of storage typically have to have them remote from the PC.