When saving your project, you will want to consider factors like who will need access to the project, and how often it will need to be backed up. Many companies have policies about where documents as important as project plans should be stored. Make sure that you follow these policies when saving your project. Microsoft Project also allows you to define two levels of password protection for your files, so only users who know the password can open or save the project. Be careful when using this feature because if you forget the password, the contents of the project will be lost.
Save Your Project
Click File, Save.
From the Save In drop-down list, pick a location to save your project.
Enter a File Name for your project. Remember to make it descriptive, but not overly long. Avoid cryptic numbering systems that might make it more difficult to find projects.
Pick the type of file you want to create in the Save As Type drop-down list. This is set to Project by default, which creates a standard Project .MPP file.
Click Tools, General Options to password-protect your project file.
Enter a password that users will have to know to open the project.
Enter a password that users will have to know to save the project if they make changes.
Click File, Save. 
From the Save In drop-down list, pick a location to save your project. 
Enter a File Name for your project. Remember to make it descriptive, but not overly long. Avoid cryptic numbering systems that might make it more difficult to find projects. 
Pick the type of file you want to create in the Save As Type drop-down list. This is set to Project by default, which creates a standard Project .MPP file. 
Click Tools, General Options to password-protect your project file. 
Enter a password that users will have to know to 
Enter a password that users will have to know to 
Click OK. 
Click Save. 
