[Karunamon]

Considering that I just picked up a 24 unit LTO5 stacker and a box of tapes for ~750, you may wish to decrement that 100% by a few points :)

The problem with live redundancy is just that, it's live. If your backups are live and online, they are not backups. (For the same reason that RAID is not backup, it's redundancy).

Think less "deployed broken code to prod" and more "this special snowflake server crashed" or "the datacenter caught on fire".

Disaster recovery.

The use case for tape is the same as the use case for something like Amazon Glacier. Perhaps you don't want multiple terabytes of your personal data being sent over the wire to a company who's no doubt been infiltrated by TLA's. Perhaps you want total control of your own data. Perhaps you don't want nasty surprises when it comes to Glacier's retrieval/data in/data out/you-didnt-wait-long-enough fees.

A single LTO5 drive can be had for about $300, tapes for $40/$50, and that'll get you around 2TB of storage each, more if your data compresses well.

Let's not pretend that there aren't real benefits to be had, here. Your use case isn't everyone else's use case, and certainly not enough to be making broad sweeping statements that nobody on HN uses it.