Backup and Restore

[kate]

Using a command in terminal 

sudo dump -0uf /dev/sdb1 /

This backs up the system to a external hard drive, how do I retrieve the
information.

The instructions say 

cd/xxx

sudo restore -if /dev/sdb1


after using this command nothing happens.

cd/xxx is were the back up is, what instruction do I tell the terminal
to display the contents of sdb1 external hard drive.


Thanks Kate