You have two easy way to do it, but not that just copy it.
1) Using the win7/win8 build-in utility to backup the image of the OS into the 1TB HDD, also make a system repair disc. You don't need other HDD.
How to: http://www.howtogeek.com/howto/4241/how-to-create-a-system-image-in-windows-7/
2) Using other software to clone the OS into a small HDD, like " EaseUS Todo Backup you can use it for backup too ", WDC HDD-Acronis True Image WD Edition Software, and Seagate HDD-DiscWizard to cloning. This is easy way but you need a small HDD, if you SSD has problem or die you just plug in the HDD, and boot up the PC, and make other cloning to the SSD, then it is done.
EaseUS Todo Backup:
http://download.cnet.com/EaseUS-Todo-Backup-Free/3000-2242_4-10964460.html
WDC Acronis True Image WD Edition Software:
http://support.wdc.com/product/downloaddetail.asp?swid=119&wdc_lang=en
Seagate DiscWizard: http://www.seagate.com/support/internal-hard-drives/enterprise-hard-drives/savvio-15k/discwizard-master-dl/