Upload & Sell: Off
Whatever else you do, don't clone the new blank drive onto the old one which has all of your stuff on it I did that once, I think because the drive letters changed as I reconfigured the drives installed in the PC and because not all drive letter allocations are (or were) fixed.
In the old days I used Partition Magic a lot to clone drives and partitions but Symantec bought it and killed it. That wouldn't bother me so much if the Symantec Norton Ghost didn't fail when I needed it most. Grrrr. I imagine that the Acronis software will achieve what you want to but I've never tried it.
Some external RAID systems will not nicely handle new drives of different capacity, whereas others will. Therefore the workflow is likely to require that you specify exactly what gear you are using.