The article uses a bad example, Blu-Ray, for comparison. Blu-Ray is not serious used in enetrprise backup and archiving.
The article SHOULD have compared the storage capacity to existing tape and magnetic disc drives. It still comes out really well.
For instance, the highest capacity hard drive I know of is 6TB. With compression, maybe 10TB. Most enterprise drives hold much less.
The current generation of LTO tape drive, LTO-6, holds only 2.5TB uncompressed.
The amount stored is so massive that rather than having shelves of hundreds of tapes, a handful will be all that is needed.
HOWEVER: since it is such a massive amount, and tape is sequential, not random access, restores may be negatively affected. Also, while a typical big league tape library may have a dozen or more tape drives spinning (IBM 3584), only having one take the place of all of them may interfere with backup windows, unless the drive (and its interface) is fast enough to keep up.
Party pooper!
And let’s not forget that tape is not a permanent storage medium. It will degrade eventually.
Or restored?
Speed of restore from tape to Disk storage has to be considered, as well as having 40 different backups on one tape drive ........ and needing 2 or more at the same time.
Tape is sequential.
I would hope that there is a WORM version for electronic records.