It almost always makes better sense to back up to hard drives that carry their own connectors and "tape" with them -- I've recently found two disks from 2001 in storage. I needed a $15 IDE-to-USB connector because I don't have IDE connectors anymore. And there were 16 bad 512-byte sectors over one 20GB disk, and no bad sectors over one 15GB disk. Easily readable.
I also had a couple of backup tapes from the same era inside the same box I found. The required drive brand is not even listed (it's not LTO), and I'd be surprised if (a) I can find a tape that can read them, and (b) if they still work properly.
But I don't need them, because the drives they backed up are still readable .....
If you want online storage, you'll need one drive per tape, and you would get huge lookup times.
> If you want online storage, you'll need one drive per tape,
No, tape libraries exist, and would be considered 'nearline' storage.
https://www.ibm.com/it-infrastructure/storage/tape/library
> and you would get huge lookup times
Yes. This is not a good system for random access.
On the other hand I paid $185 for a LTO-5 drive a year or two ago (no library, manually operated). 1.5 TB on a $20 tape is still pretty good in my book.
No offense, just seems fishy.