How to save version of every file I have saved?
Hover over the solidworks logo, or click the drop down arrow on the save button, go to file/save as and make a version like that if you need too. Unless you are talking about a configuration of a part in which you would go to the left panel, then click on configurations(3rd tab from the left) right click "*partname* Configuration(s)" and click add new configuration. Adding a feature to one configuration will leave the others alone hence allowing multiple versions. Double click on a configuration to change it
Hope this helps! :)