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.
My personal server is how I handle my backups. Currently, they would not be considered good, safe backups as I only have one copy of each but my partner is getting my 16TB of storage to throw into a RAID10 array to migrate the server over so I have actual parity data and can recover things that get borked.
Presently I have 5 TB of storage strewn across a few HDDs, SSDs, and a 0.5TB SD card. Its jank and its held together with spit and prayers, but its mine and I made it.
Obviously, nothing of import gets stored on my server, just backups of my physical media collection, which I still have access to and can backup again if need be.