> So what are HN’s favorite alternatives?

I assume when asking such a question, you expect an honest answer like mine:

rclone is my favorite alternative. Supports encryption seamlessly, and loaded with features. Plus I can control exactly what gets synced/backed up, when it happens, and I pay for what I use (no unsustainable "unlimited" storage that always comes with annoying restrictions). There's never any surprises (which I experienced with nearly every backup solution). I use Backblaze B2 as the backend. I pay like $50 a month (which I know sounds high), but I have many terabytes of data up there that matters to me (it's a decade or more of my life and work, including long videos of holidays like Christmas with my kids throughout the years).

For super-important stuff I keep a tertiary backup on Glacier. I also have a full copy on an external harddrive, though those drives are not very reliable so I don't consider it part of the backup strategy, more a convenience for restoring large files quickly.

The cheapest is a computer at a relative or friend's house. I have my backup server at my parents house. We both have gigabit fiber so it works well.

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/