Excel 2013 will show the default save location as SkyDrive but you can change this default behaviour using the option provided as part of Save settings.
Step 1: Click the File menu and select Options from list
Step 2: Click the Save tab in the Excel Options window.
Step 3: Navigate to Save workbooks section under Save option and mark the check box with label as Save to Computer by default.
Step 4: Then click Ok button to confirm and save the changes.
Now whenever you try to save a file in Excel 2013, it will default to Computer.
Change the default local folder location
Excel 2013 users can also specify the default local folder location for the file to be saved. The default local folder location is by default set to C:\Users<username>\Documents.
You can specify a new folder location by entering the location in Default local file location under Save Workbooks section. Let us say you want to save all your files under C:\Projects then create Projects folder and under C drive and enter this value for default location. Click Ok button to confirm and save the changes.
Now on selecting File –> Save –> Computer, Excel 2013 will automatically open the Save As dialog box with your preferred folder location.