I think it is worth doing it. You don't need an USB thumb drive but it is up to you. You can save as many .ady files as you want on your ipad, iphone or Android devices. Just try to give each file an unique name that you can tell what's special about it. I mean for example, if you want one that limit the EQ range to 300 Hz, you could name it EQTo300. I usually would include the date info in the file name too.
By the way, I agree with
@CajunLB , it isn't easy to make changes on a small screen such as the SE's so I highly recommend you do any editing on your PC, using the Ratbuddyssey UI (user interface) that is a free download.