Absolutely, without question.

For better or worse I’m a fully payed up member of the Apple ecosystem. I love that everything generally “just works” (maybe until It doesn’t…).

Currently use Arq with S3 but to be honest looking for something simpler. Tried BackBlaze years ago (could be 10 years ago) and found it slow and buggy, probably good now.

Would take an Apple online time machine warts and all.

I think fundamentally I believe that they would get the encryption and security around it correct, as in general they have a good track record with security and privacy.