I just got a new 1tb sata 2.5in and I want to install it, but I do not have my snow leopard disk. If I use a leapord disk will it reinstall snow leapord from my time machine backup or do I need to find my snowleapord disk?
You could just clone your current HD to the new one. IIRC there is option to restore from a TM backup when booted from the install disc so it should work, can't guarantee though.