Setup a cache for faster mobile downloads

[DXTN]

So, I'm the kind of guy that constantly is messing around with the ROMs on his phone, but it kills me that I have to download my whole library everytime I do a clean flash. So I wanted to ask, is there a way to speed up the transfer process by creating a kind of cache on my PC (downloading the playlist w/ the songs I want in my phone) so the app on android fetches them faster via WiFi just as it does with the locally stored music?