Makes sense. You can feel vulnerable in a big hurry if your primary fails or if it turns out that one of your backups wasn't being properly backed up to.
I know a lot of people these days are fine with their stuff mostly just being stored in "the cloud" someplace. But for things like photos, I really want a couple copies under my control to the degree possible.
Our current setup includes primary backups to BackBlaze[1], and eventually consistent replications to Scaleway's cold storage[2].
We would like to offer an extra replica as an addon in the future.
[1]: https://www.backblaze.com
[2]: https://www.scaleway.com/en/c14-cold-storage