I think making a list of the files to be copied and their hashes, then a list of files that were copied and their hashes, then comparing the 2 lists should provide an even quicker way to validate. Or even hashing the entire source and destination (hash of the list of hashes) and providing both values to the user to visually compare.

As far as I can tell the method described in the article doesn't really validate the backups in any way, just provides some statistics that will fail in very plausible ways.

And of course, if the data is important to you and there are special circumstances that could affect the process, nothing beats an actual restore test.