Different bits of data have different levels of privacy. My comments here, public, I have explicitly shouted them out to the world. My home address, private to friends and family. My pornhub history, private to me exclusively.

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!