The data on a NAS is worth more than the hardware, so the entire move plan should start with confirming your backups actually completed, not just assuming they did. RAID arrays are also order-sensitive, so drive bay position matters more here than in almost any other piece of home tech.
Pro tip: If you have any doubt about your backup, run a manual backup or a spot-check restore of a few important files the day before the move as a final confidence check.
Watch out: Never assume a backup completed just because it is scheduled; open the log and confirm success before you shut anything down for the move.