My current laptop is fairly long in the tooth and its OS goes into final de-support (no more security-patches - yikes!) this coming January. So, ti...
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I use Syncthing for anything I'm concerned about. It works between my own devices, so I have a few hundred MB distrubuted to my phone, desktop and laptop. It means I don't have to trust that a cloud provider will be there in a year.
For larger amounts of data, I use things like google drive and dropbox, but I rarely access them from linux, and if I do, it's usually in the browser.
Yeah, there's plenty of tools to get things into cloud-based backup-oriented storage-offerings, it's just that none of them are as cost-effective as BackBlaze's unlimited offering for Windows and Macintosh. Thus, it's less the tools I'm concerned with than the ongoing financial-outlays.
I guess it depends on how much data you need to back up. For me, I can afford to restart from scratch I guess after a disaster, but I don't feel I need to save any amount approaching the free tiers of any of the cloud providers. I pay £10 per year I think for 100GB on Google Drive (which still doesn't have an official linux client).
Cloudberry Backup offers a Linux based version of their client which can back up to your public cloud (or local l/network) provider of choice.
Try that. Or maybe rsync to a NAS (CIFS share or similar).