One way sync

i wanted to send files from android to pc for backup …and if i delete it in android it gets deleted on both … i needed it to b deleted only in android pc shld not be deleted… i have tried smeways frm forum bt it didnt work … explain me in detail for setting up … pls dont say like ignore delete i knw i have to do it in advance settings bt its not working so explain in detail what to do …like in android set to send only in pc receive only …kinda easy to undersatnd …like a step by step …