1 Exabyte = 1000 (1024) Petabytes
"You keep using that word. I do not think it means what you think it means."
1.66 factor increase in native capacity (1.5TB to 2.5TB, increased tape length and # tracks), times a 1.25 factor increase (optimistically) in compression ("2.0" to "2.5" - I have yet to see either in practice). does NOT, according to my math. yield an order of magnitude increase in capacity in the same library footprint.
PS no mention of NetBackup, but Backup Exec instead? Meh.