TBH, I am not 100% sure. I seem to remember reading that a simple copy/move may still cause problems, even if staying within the one OS.
All I can tell you is I used –numeric-owner to:
- archive from mPCIe/internal SSD to USB/external HDD, and then
- restore back to the mPCIe/internal SSD (after formatting as BTRFS)
(all within TO) and had no difficulty (which is just as well, as I’d destroyed the original FS).
Let’s wait to see what @Vit says!