Well, from the outside looking in I did not think of this, nor would have probably done it anyway as you are talking about my precious, 15 years worth of saved data, and (no offense) Drivepool is still un-trusted (to me) software. There was just something more warm-blanket-feeling about watching the manual transfer.
I'm also taking the RAID 5 offline for a few months with the old data set to have as a hot backup as I get more comfortable with drivepool, so i wouldn't wanted to have moved it off. Afterwords I'll dismantle the array and bring the disks into the pool as 'fresh' disks.
Thanks for explaining windows to me, that explains the behavior I saw.
Before my 30 days is up and I have to give you money, quick unrelated question. Would Clouddrive be a good replacement for cloudberry backup? I have cloudberry push file changes to Amazon glacier every night, encrypted of course. From what I read on Clouddrive, it's more a live folder of your cloud storage type app, and not a backup your data to cloud app. Is this correct?