..it's quite common to have problems with viewing actual files within the folders. Windows Backup isn't an ideal way of actually making copies from one computer to another. Instead, if you're trying to backup the entire computer, make a disk image using various types of disk image software. Windows 10 still has an option to create a disk image in the Control Panel-Backup and Restore (Windows 7) or there are other types of disk image software available.
On the other hand, if your having problems doing a simply copy and paste of folders which contain files, then that's a different issue. If that's the problem, then try using a different USB drive. You didn't say whether the USB device is an external hard drive, which are frequently known as unreliable and could be the root of the problem if its failing, or a USB flash drive. Either way, try a different one.
Hope this helps.
I am no expert, but I have had some experience with windows.
When I try to backup my laptop to a usb drive and then transfer it to another computer the receiving computer shows all folders as being EMPTY and of course I cant transfer any of the information in those folders since even the computer I copied them from shows only empty folders in the destination usb drive . loose files however copy fine. if I use a search program ( agent ransack) it shows the folders and the files and I can open and copy an individual item from there onto a created folder in the destination....I cant however copy a folder over even though it contains the info as I described above...…