How do I backup the files in the home directory on my website?

Login to cPanel (www.yourdomain.com/cpanel) and click the Backup icon. Then click "Download a Home Directory Backup."

I new window will pop up, asking if you want to open the file or if you want to save it to disk.

Make sure you have the save to disk option selected and click OK. Browse to the directory on your computer where you want to save the file and then click OK (or Save).