Ok, so connect your android to your wireless router (which I presume your PC is also connected to by either wireless or LAN cable, doesn't matter which) then use a sync app like Folder Sync by JRT studio. I've not used that specific app but it should be just a case of setting up a local folder on your Android and a destination folder on your PC (probably needs some kind of service app to be installed on your PC end too... you'll have to look at the app's documentation).