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Creating an online account on the Zotero website may be useful for accessing your library from another computer or for sharing references with other students you are working with. Storage space on the Zotero website is limited to 300 MB (for attached files only). If you exceed this storage space, you can:

• rent some additional space (starting at $20 per year for 2 GB)
• store your files on an external WebDAV server: create an account with a WebDav service. Go to the Sync tab of the Zotero Preferences menu, and in the File syncing section, select WebDav from the drop-down menu after "Sync attachment files in My Library using". Enter the address of the WebDav server you chose, your username and your password, and click on Verify Server. 
• store your files on Dropbox or Google Drive using the Zotfile add-on: after installing Zotfile, go to the Zotero Preferences menu, Advanced, Files and Folders, Base Directory, and enter the name of the Google Drive or Dropbox folder where you want to store your PDFs. Then go to the Zotfile Preferences, General Settings, Source Folder for Attaching New Files, and select the Google Drive or Dropbox folder. Here is the detailed procedure with visuals for Google Drive. You can use the Drive File Stream to keep your files synchronised.