Ron has an old Mac running OSX High Sierra. Now it's taking forever to back up after a recent update. Leo says that the update may have been corrupted and as such, it's searching for a file that it can't read. It may also be that the hard drive is flakey or is about to tie. If he gets another Mac, he can copy the data over from that old hard drive before it completely fails. When he boots it up, he should hold down the "T" key. That will turn it into "target disk mode," and that would enable the ability to connect another computer and copy the data over. But it has to support firewire.
When the Apple Store reopens, he can have a genius do it.