The recommendation to verify all of your backups, is legacy code, and old thinking of the Conner/Segate/Veritas days, that Symantec, hasn't weeded out yet.
As a legacy product, BackupExec and many other backup products were primarily tape based products with disk features bolted on over the years/revisions. If you were around the era of DDS tapes, you'll know how bad and unreliable those were. As such, you had to do verifies to make sure your tape copy wasn't corrupt.
As hard drives have gotten larger, faster, and very reliable especially around RAID types and RAID controllers; you shouldn't need to verify anything on disk.
LTO technologies since LTO3 onward, are super reliable, and it's arguable that you don't even need to do it to that format of media. Many enterprise applications like NetBackup, Commvault, Networker do NOT do a verify unless you specifically setup a task for it.
That said, it's not a bad idea at bare minimum the tape copy has it performed, and not the disk copy. However, many other products don't do it, and they are protecting 10x the amount of data, which would mean 10X more the potential for failures, yet don't have that level of issue...
It's your business, your data, only you can put a value on your data, and the risk the business will allow.
