Back up your work! and save versions! Backups are not quite the same as versions, but both are important.
Keep backups: copies of your files that reside on different physical devices. A good backup plan involves duplicating your work across three different storage devices, kept in two separate locations.
- USB thumb drive
Also, save versions of your files as they progress so that you can return to a previous stage of work if it turns out that the earlier approach was better, and so that you can show your process.
You might keep versions by numbering files:
Or by putting dates on files: