In the Open File dialog, browse to and select (but don't open yet) your good backup assembly file. Click the References... Button. Double click the parts and point the links to the good backup copies of your parts. Then click Open.
If you still have bad external references, then your backups are likely bad.
if it is good, you can pack-n-go the assembly to your working area. Good luck!
Thank you very much for the answer!
I actually got this to work using kind of a kludge with "replace components", but your solution would be easier for the next time I get into trouble.
Another way is to use File Explorer and right click/properties/previous versions/restore then you can go to the most recent restore date