wpmu site cpanel backups for just one sub-domain

I have a multisite with sub-domains. Can you download for a client, the backup files for an individual sub-domain on a multisite?

If yes, how? What are the steps?

If no, then if one sub-domain has problems you need to use a backup for the entire multisite?

There's got to be a way, since you can take the files of a separate website, and add it to a sub-domain on a multisite, correct?

You can also, transfer an individual sub-domain of a multiste, and then make it it's own website? Maybe I should look at that.