t21drl

I was using Storages paces in windows 8.1 however the lack of reblanceing has left me looking elsewhere and if i am right this is the software for me! I have X1-500gb X2-1TB x3-2TB and X2-4TB drives. Some of these drives are sata connected some are USB which shouldn't be an issue i assume? I have about 12TB of data and don't care too much about write speed or read. i was thinking of just using parity however i would like the option to add more drives in the future and also not have to worry about a corrupt windows effecting my pool of drives if i have to reinstall my windows drive. Am i right in thinking once i start copying data it will start to rebalance or i can ask it to rebalance once i have finished?