Backing up with time capsule

I just got a time capsule for Christmas.

I used to back up using time machine on an external hard disk. I know that I can now do it on time capsule but here is my question.

I have too many photos and my laptop hd being full, i moved the photos on an external disk. If I plug this external disk on my laptop. will this external disk also be backed up on time capsule. Do I need to do anything for this to happen?

via ehMac.ca http://ift.tt/1HERHwA