Recently, I decided to consolidate my setup.  The parity drive has been upgraded, and replaced, from a 4TB to a 12TB.  In addition, my data drives are 4 x 3TB.  I purchased another 12TB drive to be used as a data drive.  I would consolidate all the data from the 4 X 3TB drives to the one 12TB.  Eventually, I will add a 3rd 12TB data drive.    I've seen a video from YouTube and suggest using Krusader and sync the each of the 3TB disks to the 12TB disks.  Is this best way or there are other methods?  I'd look at the Wiki for shrinking array but it still mentions that I need to move the data manually.

 

Thanks!

Krusader, midnight commander, rsync, Windows explorer or the unbalance plugin are the most common ways.

Using those tools, do I have to worry about data duplication?  

If you're worried about that move instead of copy, always disk to disk, never share to disk.

Much appreciated!