1 pointI think Retrospect will wait for the transfer to finish. You don't even have to update the scripts. Just use the "New Backup Set" backup (or transfer) as outlined here, and Retrospect will update the script for you: https://www.retrospect.com/en/documentation/user_guide/win/fundamentals#backup-actions
1 pointJust installed this update and tried the same Duplicate 'Replacing all contents' from the client to the Retro server machine. This time it works as it should.
1 pointAssuming you are talking about a "Disk Backup set", this is what you do: Exit Retrospect. Move (not copy) the folder with the *.rdb files to its new location. Launch Retrospect Configure-->Backup Sets. Change the location in the "Members" properties by clicking on the "Browse" button. See attached picture.