Scheduled backups will automatically mount, copy and unmount, so there's nothing you need to do (except set up the schedule and eject the drive).
As far as backing up one folder, add the "Exclude all files" folder in the "Include" tab of your script, then add the folder(s) you want to copy in the command tab.
In general, though, I strongly encourage a full backup.
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--Dave Nanian
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