to save power, and to make organizing my files easier, i try to run as few, big drives as possible in my main computer, as I upgrade regularly to have the biggest drives, this leaves lots of spare drives that i put in and old computer that i use as a backup computer, kinda like a big external harddrive, I also "RAID" (that is to say i manually make duplicates of the files on more than 1 drive) this backup computer, cause all the drives are so old they are likely to fail, I use my own program that i made to make the backing up as painless as possible