Sounds like you want a modern equivalent of one of the old Auspex/NetApp servers that used distributed RAID HDDs for the the head of every file, backed by optic

Sounds like you want a modern equivalent of one of the old Auspex/NetApp servers that used distributed RAID HDDs for the the head of every file, backed by optical disk robots for the rest, so for large files, you get a nice cross of the performance of HDD with the cost of optical. Also, no one here has mentioned Duplicati yet (https://duplicati.com https://duplicati.com). I switched last year, and it's flat wonderful. The versioning and backups just work, it's free and open source, runs on pretty much everything, has good encryption baked in, and supports a really broad array of backend storage protocols for both cloud and local. Oh, and it comes with a pretty decent scheduler and a web-based GUI interface. Quite honestly, the best piece of OSS I've adopted in the past two years. I no longer pay for any backup software (just S3/Wasabi storage), and I no longer have to do any integration or management of the moving parts - it just works. I like that, as I no longer have the patience for crappy software now that we're two decades into the 21st century.