I'm looking for privacy focused backup alternatives as an iPhone user. What does the forum suggest?

I am researching into both of these suggestions. There are two things that are making me cautious w/ Proton. There’s no middle tier storage size. Either it’s 1tb or 3tb. And if I pay for 12 months and cancel in month 1, I won’t get to use the rest of the months I purchased. This seems consumer unfriendly. I will still look into iMazing. Thank you for your suggestions.