Windows Server: audit space usage (latest files/folders added and size)

i work in a design agency (designer, little knowledge on programming). we have a Windows Server machine (Windows Storage Server 2008) that holds all our jobs. it's going to go under maintenence soon, because it got really slow after a thunderstorm.

however, i'd like to know if there's a native way or something that can be done to find out the latest files/folders created and the space they use. because in the last month, there's been a huge increase in the space usage, coming to something like 20GB in one single day (it shouldn't be more than 4GB/day).

i'm looking for a way to find which jobs are with this unnecessary extra space and help people work the right way.

thank you!