I have always have my Library folder showing. I found it irritating back when Apple decided to hide it. It felt like they were trying to legislate intelligence to ignorant, know-nothing users to prevent them from damaging something in there because they didn't know what they were doing. I've been using Macs since 1989, macOS v6, so I have a history. I used to show it via a Terminal command but thankfully Apple finally did make it a bit easier with a checkbox.
I haven't ran Disk Utility on the two TM drives. I have always found DU to be a lightweight when it came to fixing drives. But I'll give it another go. I did run Disk Warrior 5.2 on both drives however. It took 4+ hours on each one and it repaired a lot of icon flags and text encodings among other things. But it made no difference to the -1407 error.
I have done that to my Home folder in the past, probably many times, but I did it again this morning, just for grins sake. At first I was wondering why my Home folder would have anything to do with this error. But, after mulling it over, I realized that I was trying to restore the file to my Desktop, which I have always been able to do in the past. And obviously my Desktop folder is in my Home folder. Hmm. So, last night before I went to bed, I tried restoring a file from the TM backup again, but this time I was restoring to another drive in my Mac, one that has the ownership ignored. It worked! So this is most likely some kind of permission issue somewhere that I would like to resolve. But at least now I have a viable workaround. I have always hated permissions since macOS went Unix. Necessary, but irritating to say the least. Kind of like the rebuilding of the Desktop file of the 90s.
Thanks again. Please chime in if you have any other ideas on this.
J D Thomas
ThomaStudios