I recently signed up to a Personal Backblaze cloud backup subscription. The product has some severe limitations: it only runs on Windows, for example; and it takes no notice of -and refuses to back up- anything a Windows PC is connected to via the network. It's one huge saving grace, however, is that for US$55 per year, you get unlimited backup capacity. If, for example, you plug in a 12TB external hard disk via USB to your Windows PC... that counts as local storage and therefore gets backed up to Blackblaze within the personal backup allowance. Add two more 12TB USB drives to the PC and you've just got 36TB of cloud storage for peanuts!
Yes, not working on Linux is a bit of a drawback for someone who stopped using Windows at all in about 2016 (and had spent the 20 years before that trying to!)... but it's not exactly hard to find an old PC and throw Windows 10 on it and then script something on Linux to push my music collection across to it. Once the music collection has been copied to the Windows PC, it heads off to the cloud, courtesy of Backblaze. I already have six copies of my music collection on various NAS devices and external USB drives. I even have an offline copy, on a pair of disks which only get plugged into a PC once a month for a refresh. But thanks to Backblaze, I now have an offsite backup. You know, for those times when the house catches fire or falls into a sinkhole. [...]