1 cache for all should be 2 caches for own/foreign stuff

Today I cleared my cache and all of my files were gone, too. That's bad, because my own files get maintained rather regulary, and when they're gone from my account, who guarantees me that my whole file can be reconstructed from the pieces that are in the wild.

so there should be 2 "clear cache" buttons. one for the things i uploaded and the other one for the stuff i downloaded from others. I need the second type of button 1000 times the occasions iI need the first type