"Better would be to get a 2 TB drive and either a 3 or 4 TB drive. You can likely just take the drive itself and install into the existing enclosures by unscrewing a few screws and replacing the existing drives."
In theory, yes, but have you ever tried it? I've done it several times and its no easy task. The drives inside the external enclosures are internal drives, so there's no problem there. Its the tamper proof case that's difficult. You need to be good with tools and be really careful, but it can be done.
Assuming you are OK with opening up the cases, newer 1TB internal drives are half height, so depending on how old your 1 TB external drive is, it may make a difference. If its a few years old, it should be full size, like a 2 or 3tb drive. But if your current external drive isn't that old, it may have a half height drive inside, and a full size one may not fit.
In theory, yes, but have you ever tried it? I've done it several times and its no easy task. The drives inside the external enclosures are internal drives, so there's no problem there. Its the tamper proof case that's difficult. You need to be good with tools and be really careful, but it can be done.
Assuming you are OK with opening up the cases, newer 1TB internal drives are half height, so depending on how old your 1 TB external drive is, it may make a difference. If its a few years old, it should be full size, like a 2 or 3tb drive. But if your current external drive isn't that old, it may have a half height drive inside, and a full size one may not fit.