Comment by brycewray

Backblaze's B2 storage is fine if used with a separate app over which you have more control. Others here have mentioned Arq. I have used it, as well as Kopia[0] and Blinkdisk[1] (Blinkdisk is essentially Kopia but with a nicer UI). Can recommend all three highly; the latter two are FOSS.

[0]: https://kopia.io/

[1]: https://blinkdisk.com/