https://www.arqbackup.com/ is great, you can choose your own backend store, like S3 or Backblaze B2.
And there's https://www.arqbackup.com/arqcloudbackup/ if you don't want to have to manage that yourself, a more direct competitor to Backblaze.
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Important to know Arq only runs on mac/windows but has an open source client for mac/windows/linux that can do restores. So if they go out of business your data isn't lost (presuming you used a cloud backup that still exists).
I left because Google's rate limiting makes them really slow.
Also they mix together all errors including permission errors and "the file is being accessed by another program" so every run will have a few hundred errors (in fact, if I got zero errors that always a sign that the backup hadn't run correctly).
Big fan of Arq! Been using it to backup to my NAS + Wasabi + Google Drive for the last year or so and it's been rock solid.
https://www.duplicati.com/ is a solid FOSS option as well though I've found it to be a much less polished experience than Arq.