If you have a bigger budget around $2k something like LTO7 with 6TB tapes would be fantastic for larger data sets.

The lto 5 drives are around $400 on ebay and the tapes can be had for around $20 each - less if bought in bulk and each tape hold 1.5TB.

I don’t find it that slow as in the event of a restore like i am doing at the moment, I can get through around 3 tapes per 24 hours.

One thing I will say is although newer LTO standards allow you to treat it like a normal drive it works better using proper software designed for the task like Iperius Backup.

I have around 65TB backed up on LTO5 tapes. Found them very reliable when needed for a restore and great for an off-site backup.

However I would say it is overkill for anything under 20TB.