The process of making an extra copy of a file and storing it on a separate storage medium.

The process you're referring to is known as "file backup". Here are the steps:

1. Identify the file or files you want to backup. This could be a single document, a folder, or an entire hard drive's worth of data.

2. Choose your backup medium. This could be an external hard drive, a USB flash drive, a CD/DVD, or an online cloud storage service.

3. Copy the file or files to the backup medium. If you're using an external drive or USB, this can usually be done by simply dragging and dropping the files in your computer's file explorer. If you're using a cloud service, you'll need to upload the files through the service's interface.

4. Verify the backup. After the files have been copied, open them from the backup medium to make sure they were copied correctly and aren't corrupted.

5. Store the backup medium in a safe place. If it's a physical medium like a hard drive or USB, you'll want to keep it somewhere where it won't be damaged or lost. If it's a cloud service, make sure your account is secured with a strong password.

Remember to regularly update your backups as you create or modify files.