Server 2012 Standard - Backup Clients?

Hi all

I have 2012 standard trial and I want to use it to backup my client machines - what WHSv1 does for me at the minute.

Is there a way to add essentials like functionality to standard? I don't want to purchase any licenses as this is for a home testing environment.

Looking to de-comm WHSv1 to free up the extra gig of RAM.

Thanks