Coressence, it appears that unlike the RAID array Tbg uses your Music Vault server does not utilize drives that are mounted in readily removable trays. So I don't think that his approach is applicable to your situation.
If that is correct, I would simply select a 2TB USB external hard drive from among those listed by NewEgg.com at the link I provided earlier, taking into account the user comments that are provided there. Although keep in mind that those comments inevitably reflect a disproportionately high percentage of negative experiences, and comments that were not posted fairly recently may not be representative of currently manufactured product.
Also, I note that some and possibly all of the Music Vault models can accommodate direct connection of a USB external drive, which may prove to be more convenient than the usual approach of copying via a computer.
Regards,
-- Al