2TB of capable data capacity.
I had to format my external so I had to pitch it somewhere, as I go through the files and sort them I'll get space back due to deleting them.
I put them back on my external not only cuz of the eyesore but also as you said Tomshawk, corruption was a very real possibility.
Stephen, My new main machine I'm building is a lot more conservative. 128GB main driving SSD for OS and some software, 500GB for everything else on a secondary HDD.
However, the backup computer is capable 2.5TB which is for... well backups.