Cloud sent everything back to pc and now hard drive is full.

Attempting to save files to "the cloud", the cloud then sent every picture and video back to pc. I realise I had that box ticked in the program - after the event. My 2TBhard drive is now full, and I am unable to find any obvious place the files and photos have been sent too. I have backed everything up to a 3TB external drive so I can clean up. Any hints as to where this massive file has gone.