If you have Hub Protect or don't it's the same backup - just different UIs for the same result - creating a full cloud backup from the C-7.
We've been told antennas should be vertically oriented - point up or down, not sideways - parallel to the ground is not good.
You can have them paused during migration - I didn't see any issues for any I had paused.
@ogiewon had a great set of steps here. Only thing I'd add is if doing it again I would update the new hub to the current FW first so you don't have to do that after the migration, which saves you having to take another backup of the new hub immediately after migration.