How can I temporarily remove a RAID set but keep the data?

I recently had to restore my Netgear ReadyNAS to factory settings, which meant that I needed to make a backup of its data and restore it afterwards. The only possible way to back up the 8.5Tb of data was to get 9Tb of WD Red disks and somehow use them - so my immediate thought was that the Mac Pro would be a good idea. I t had four drives in it, but three of them were not being used by the OS so they could be temporarily removed.
So I replaced three of my four Mac Pro drives with new 3Tb drives and used Disk Utility to set them up as a JBOD. I then used this JBOD drive to back up the NAS and restore it again after I had re-installed its O/S (the whole thing took two weeks!!!).
So now I'm in the following situation:
* I want to tear down the JBOD set and take the three new drives out of the Mac Pro again and replace them with the drives I normally use there so that I can go back to making music (which is what I usually use it for).
* I also want to be able to put the new drives back in and read the data as a JBOD again if needed (in case anything is discovered to be amiss with my ReadyNAS backup/restore operation) - let's say for the next month I'll plan to keep the old drives around for safety.
How can I remove the JBOD set in such a way that I can set it up again using the same drives, and access the data (i.e. I don't want to delete the RAID set the usual way because that will delete the data too - apparently...)?

Going to ask the mods to move this to MacPro, Hatter can answer your question, but I'm pretty sure if you power down and remove the RAID drives, you can put them in back again and boot up and the RAID will still be recognized as the info is stored on the drives themselves in the GUID/MBR of each drive in the set.
Also you should know, there is a new MacPro coming and it doesn't accept internal drives, only external.
So you should prepare and have some sort of external hardware redundancy for your data that isn't dependent on the Mac HFS+ formatting as Windows doesn't read that.
Perhaps exFAT would be better as both platforms can read/write that, but if the drives are going to be used with a PC ever, they need to be formatted by Windows for exFAT to get it right. Check first before you commit to copying huge data over.
Anyway research it, because if your MacPro dies, you might be up the creek and have some issues getting at all that data since it's in a RAID, external options might not work correctly or reliably for RAID.
Also consider talking to the fellows at MacGuru's, they are external RAID box setup experts for Mac's, sounds like you need a RAID 5 box, gives redundancy and can connect to any computer.
Hardware RAID is more reliable than software ones, cross platform as well.
good luck.

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