This process copies the contents of the /primary folder on the System SD card over the /backup folder on the same card. Any files with matching file names are replaced. This takes approximately 6 minutes. For methods to restore from the /backup folder see Restore from the Backup Folder.
These processes do not backup the prompts, messages and greetings used by the system's voicemail mailboxes and auto attendants. They are stored in the card's /lvmail and /dynamic/lvmail folders.