swapping 4 HDD from one NVX to another NVX

Should have no effect on the data. When I got my second NVX (a Business Edition) to add to my NVX Pioneer, I decided to make it my primary NAS and the Pioneer the backup. I simply shut down the Pioneer and move the set of drives (complete with trays) to the new BE, maintaining the order (from slot 1 of Pioneer to slot 1 of BE) and after inserting the fourth drive, closed the front and booted. Everything came up as it was, and the drive mapping of shares in Windows still worked just fine since they map to host name and the host name (NAS1) went with it. I then added the new drives to the Pioneer and began the backup.

This of course assumes a healthy array. If there is a problem with the array, it will go with the array to the new chassis. This procedure will also work with any other chassis withing a family as long as there are enough bays to accommodate the drives. You can go from a Duo v1 to an NV+ v1 and vice versa (unless the array has three or four drives). You can go from an NVX to a Pro 6 and an Ultra 6 to an Ultra 4 (as long as the array is four or fewer drives).

But, backups are always important.