There are several reasons why you would want to be able to find your save files if you are a FF7 payer. Among the popular reasons, one is to generate backups that prevent progress loss in case saves are lost or corrupted. These backups are doubled as saves; you can get back to it at a later date for mere nostalgia or to check how much of progress you have made in the game. Certain third-party applications that let you change your game saves also need access to the save files. That is why it is important to know where your saved files are.
But the question should not be why you would want to access your game saves. Rather, it should be how you can access them. For your operating system, you can get help below:
%HomePath%\Documents\Square Enix\FINAL FANTASY VII Steam
To access that path, just open up a File Explorer window, go to your Documents, then into the Square Enix folder, and finally the FINAL FANTASY VII Steam folder.
Inside this folder, there will be at least one other folder that is named user_ followed by a bunch of numbers (based on your Steam ID). Inside the user_ folder relating to your account, you can find your save files. The save files will be named save**.ff7), where ** is the save number.