I had backblaze, and it’s really a bummer they don’t support linux. The closest one I’ve found is Icedrive, but it costs a bit more. I don’t mind paying a bit more though for a FOSS solution (technially not free but yeah). I probably only have 2 TB of actual important stuff but it would be nice to have more for future.
I have a numebr of backup systems going on, but if i take “cloud” to mean “offsite” then my sution to that is a proxmox backup server set up in my home (great for proxmox PVEs but you can back up anything to them) and my friend 3000 miles away also has one in his home. We each set up sync jobs so our local backups are also stored on the remote proxmox backup server.