Click the File tab.MindView documents are saved as .mvdx files.
To save a document:
Click the File tab.
You can now choose either:
Save to save your document under its existing name and continue working in MindView.
Save As to save your document under a different name, in a different location or as a template; see below. This is also a way of creating a copy of your document.
To save your document, you can also just click the Save icon 
in the Quick Access Toolbar or press Ctrl + S.
You can get MindView to save the previous version of your document automatically as a .bak file by enabling Create backup of document files in the Save panel of the MindView Options dialog. For more information on that dialog, see "Setting up your preferences".
From the Save as dialog, you may also save your document in an online place such as the MatchWare Shared Workspace, Microsoft Office 365 or a Microsoft SharePoint site. You may also add or manage online places. For more information, see "Opening and saving online documents" and "Managing online workspaces".
You can also save your document as a custom template for future use. This allows you to create new documents based on your existing ones. To do this:
Click the File tab.
Choose Save As | Save As Template.
Click Save.
Your template is saved with the extension .mvtx and is listed in the My Templates folder when you create a new mind map based on a template. For more information, see "Creating a mind map".
You can create any number of sub-folders in the My Templates folder from the Save As dialog or Windows Explorer. These sub-folders will be listed in the My Templates folder. You can also rename or delete sub-folders or templates as necessary from the Save As dialog or Windows Explorer. Another way of deleting a template is to choose File | New | New from Template, open the My Templates folder and click the red cross icon at the top right of the custom template.
You can also save your templates elsewhere on your computer or network, but if you do so, they will not appear in the My Templates folder when you create a new mind map. To use a template saved in a different location, you will have to browse to this location and open it as a standard MindView file.
If you save a document after having made some changes which you wish you had not made, you can restore the previous version of the document as follows:
Click the File tab and choose Open.
Browse to the folder containing your MindView document and enter the file name *.* in the Open dialog to view the list of all the files contained in that folder.
Select the filename.bak file, where filename is the name of your MindView document and click Open.
Click the File tab, choose Save As, and save the .bak file in its original location and under its original .mvdx name to overwrite the incorrect version of the document.
By default, a temporary copy of your document is also saved automatically at regular intervals to allow auto-recovery in the event of a program failure. To disable automatic saving of auto-recovery information, uncheck Save auto-recovery info in the Save panel of the MindView Options dialog.