You can sync and un-sync files from a SharePoint site to your computer using the steps below. This sync utilizes the OneDrive sync client, and provides a similar experience for accessing your files.
On the SharePoint site that you want to sync files from, select Sync.
Note: If your browser asks for permission to use OneDrive, confirm that it's OK.
Sign in to OneDrive to start syncing your files and finish OneDrive setup.
Learn about files on demand to avoid filling up your hard drive with synced files. This video and article from Microsoft should help get you started.
Please note, you cannot sync the same content more than once. That will result in a broken sync.
Click here for detailed information about working with synced files, including sync status icon, moving files, and deleting files.
Microsoft video training and more information here.
If you sync a site, then later decide you want to un-sync it, it is a TWO step process to undo the sync.
On a Mac, click the cloud icon in the upper right of your screen.