What hardware and software for large backup?

[Domeen]

Hello!

I have 2 identical WD Caviar black 1TB drives. One is inside my workstation and holds all my photos, the other is in an external enclosure and is a mirror copy of the internal one.

I am running out of space, fast. That 1TB that seemed so large when I bought the disks is no longer sufficient.

I am looking for a budget friendly but reliable and expandable solution.

I need a cheap NAS. It should have at least two disk bays and option for RAID 1

Which would you recommend

Or would it be better to have 4 bays into which I could just add another drive when the need arises instead of taking the old drive out and replacing it with a bigger one?

 

[Dereck47]

RAID-1 is not backup, it is redundancy.

It would be best to have the same setup you have now. Instead of having 2 identical 1TB drives, have 2 identical 4TB drives.
Here's an example of one: http://www.newegg.com/Product/Product.aspx?Item=N82E16822178338