I was actually wondering the second question you asked so I searched the forums first and instead of posting a new thread, I figured I would just tag onto this one.
My understanding thus far to answer your question:
1. Mover moves the files from /mnt/cache to /mnt/disk1 or /mnt/disk2 depending on your Allocation method in Share settings.
2. To quote itimpi in this post:
Granted that was in 2022, so not sure how much has changed since then. Hope this helps.