ReadyNas 516 preparation

I am in the process of doing this same thing.
I chose 2tb instead of 4, so times may be different.
The firmware update with one drive was pretty quick.
The factory reset with all of the drives took about 5 hours.
The conversion of xraid to raid 6 took about 6 hours. converting back to xraid2 was pretty quick.
I chose to do a scrub to test the drives after the raid stuff was done. Another 5 hours.
Not a real 'test', but adequate for me since the drives all made it through the initial setups.

I am now doing the nfs backup job to move from the NV+.
After 2 hours I have moved 270gb. I have about 750gb of stuff so that should not take too long.

The only mistake so far was that I registered the 516 before doing the factory reset.
Now I get a message reminding me to register. I need to figure how to satisfy that.