During a project you will have multiple versions of data files. A common best practice is to save the original raw data in a secure location. The file would then be saved as a new name in the file you will be working from. That way, you can go back to the original file as needed, or worst-case scenario, start from the beginning.
There are varied recommendations for file naming conventions, but there is an agreed upon understanding that you should choose one. In most direction, data users are encouraged to consider how they will access their data and what sorting method makes the most sense for you. Here are some resources on file versioning: