Posted 23 July 2018 - 05:39 PM
You don't make backup files "readable" as in human readable.
From what you've offered it sounds like these backups may have been made using Windows built-in "Backup & Restore". Regardless of what utility was used to create the backup files, the way to get what's in them back is to run the corresponding recovery function. They were never meant to be able to be read by humans, but by the program that created them (as backup and recovery are two sides of the same software coin).
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain