I've used rsync.net since some time before the warrant canary - I'm guessing around 20 years - and I only have nice things to say about the service. Even though I'm just a retail user, the couple of times I've needed support, it was prompt and helpful.

I've heard and read lots of stories of people losing all of their data in some accident or theft, and that's just something I don't have to worry about.

Can't think of any other service as reliable over such a long period of time, with the possible exception of running water.