Every member is allocated 2GB of storage space for free across their portfolio and their projects combined. Any file that you upload to your portfolio or projects where you are a collaborator will be counted toward this 2GB limit. You can use that space any way you want across these Nomad/9 tools, but you will not be able to go over 2GB total.
One way to reduce the amount of space you use is to embed videos from Youtube or Vimeo, rather than uploading them to your account. You can do this simply by copying the URL of the video.
For more directions on embedding video files, go to Support Center question: "How can I embed video files?"