Take the hassle out of manual backups with OTB. Initiate customized backups at the touch of a button. Ultra thick 2.0mm solid aluminum chassis is extremely rugged and thermally efficient. This JBOD enclosure automatically combines any two hard drives into one large volume so you can easily expand storage space. Includes two user changeable color bezels. New maximum capacity is now upgraded to 2 x 2TB for a combined single volume of 4TB.