I'm performing a test backup of /home/username/public_html

In the 'Backup Device Settings' screen I see the following in the destination directory:

file://var/lib/amanda/vtapes/testbackup (I specified 'testbackup')

How should I change this for my test backup? Also, here are the rest of the settings (which probably need changing as well):

- Media Type, 'Disk'
- Tape Type, 'HARDDRIVE'
- Size, '5000'
- Number of Slots, 0

Finally, I want my backups to go to an external hard drive I have named 'EXTERNAL'. How would I specify that?