Why does that need to be cloud storage at all? Off-line storage is the securest option, so you need a very good reason to want to put it online.
16 GB USBs are a few dollars each, buy a bunch, store duplicates across the USBs. Make sure you plug them in an use them once a month, and that will easily last you all year. And if you need to give it to your healthcare professional, just give them the USB.
Good luck on your weightloss!