Saving a project file to your computer is similar to saving a file in any other program.
Click File > Save As.
Click Computer and then click the folder where you want to save it.
Type a name in the File name box, and then click Save.
Of course, you’re not limited to saving just to your computer, but to other locations also: My Projects - Drive365, Project Online, SharePoint, Box, OneDrive, OneDrive for business, Dropbox, Google Drive and BaseCamp.