Does anyone know if you cancel a PS Plus subscription, and re-buy a game that you downloaded for free earlier, does you save file transfer over? I only have a Vita and not really making much use of PS Plus, but I want to "keep" Binding of Isaac Rebirth after my subscription ends and I don't want to lose any of my progress. Thanks.

Yeah, as long as the save data is on your memory card and you don't delete it, it should be fine. Mind that if you delete a game off your Vita, it will by default delete all DLC and save game content as well. You can circumvent this by uploading your data to the cloud (if you have PS+), or moving it onto a computer or some other data storage (using USB or Wi-fi.)

@ateatree: So is it possible to re-buy a game that you already have downloaded on your system? I was under the impression that you would need to delete the free copy first and re-download it, thereby losing the save file in the process unless it was backed up.