Moving folders · Moving folders back
What happens to files I added to a moved folder when I move it back?
Short answer: They're kept. The Move back sheet counts anything written to the original location since the move and includes it. On a conflict a normal move back keeps the newer file; files that exist only on your Mac are always kept.
They're kept and included. If anything was written to the original location after the folder moved, the Move back sheet counts it, shows its size, and notes it "will be included in the move back".
When the same file differs on both sides, a normal move back keeps the newer one. Files that exist only on your built-in drive are always kept, even with Force move back on (which makes the fast-drive copy win conflicts instead).