Do you have any nerd friends? I just "trade" NAS space with a few of my friends for remote backups. They allocate me a few TBs on their servers and I allocate

Do you have any nerd friends? I just "trade" NAS space with a few of my friends for remote backups. They allocate me a few TBs on their servers and I allocate them a few TBs on mine, and we all give each other some locked down shells for remote access (bubblewrap, jail, VM, etc. everyone has a different approach). I'd say grab a few 8-16TB disks, throw them in a raid 5/6 with a filesystem that supports snapshots and compression, dump all of your 23TB of data into it, come to a trade agreement with a couple of friends, and sync your 6TB of important data to your friends' servers (gifting them a drive >= to your storage needs can grease the wheels here). The details don't really matter as much as the overall architecture. I personally have something like 12 drives haphazardly shoved into an old desktop case with a couple pcie sata expansion cards for extra ports, all dm-crypt'd and gathered into a btrfs raid6. I regularly rsync my other systems to the backup server and take a snapshot after each sync, so I have incremental historical backups for every live system. Backups of retired systems are just static and never get touched. The really important stuff gets synced to friends' servers using restic (encrypted, incremental). You can make the whole setup very flexible and reliable at a very low monthly cost if you just work with what you have and get your hands a little dirty instead of relying on commercial services.