My system information shows 232gb used as a "back up"on my internal hard drive even though I use time machines and a external hard drive.

Hi

I have had my mac book pro for almost 6 months. Whilst using a 500 gb portable hard drive with time machine, I was surprised to get a message saying there wasn't enough disk space to complete a back up.

I brought another but started to look into why I had used so much space. In system information I had this view. Can anyone help me find where to clear this back up which is taking up so much of my hard drive.

Thank you

Dan