Best 1Tb Internal Hard Drive?

Hey community,

I'm going to purchase an internal hard drive to use to backup my system drive and data to. I would like the capacity of this drive to be 1Tb. I'm interested in your opinions on what the best 1Tb drive to use as a backup is - I am clearly looking for reliability and durability over performance.

My current relevant hardware is:
Crucial M4 128Gb SSD (system drive - Win 7 x64, games, apps)
Seagate Barracuda 1Tb 7200.12 6.0Gbs HDD (data drive - user folders, media, etc.)

I plan to plug the backup drive into the SATA x-dock on my Cooler Master CM 690 II Advanced case. This dock provides a SATA connection externally - this way I can swap drives for redundancy and store the drives offsite. I believe this dock provides 3.0Gbs speeds, but it may provide 6.0 speeds... I'm not totally sure.

Please help me with some recommendations.

Thanks!