I understand that you're supposed to do a Batch Re-save when you move a library. If I move 69 libraries from my Mac HD to join the other 230 or so on my external SSD, there's no way that I know of to select just the relocated ones for Batch Re-save.
I tried to Batch Re-save 130 libraries when I had a computer problem. It took 4 days and then aborted the process due to an error. ugh.
Any advice on how to best manage this?