My first SAS..a simple question.

I bought for backup this controller

LSI LSI9212-4i4e 6G SAS

I will buy a quantum reader like this

Quantum TC-L62BN-EM 2500GB LTO

Two simple question

a)I read..2500GB,this mean i cannot use tape lto6 over 3tb?
b)Wich external cable?A sata external cable is good?

Thanks