[orca-list] backup problem in ubuntu

[michael weaver <weavermicha googlemail com>]

i am having a problem backing up files using deja-dup which i 
have installed on my laptop with lucid beta 2.
i get the error message "backup failed" and "this location is 
already mounted."
i tried sending my backup to a re-writable dvd.
what am i doing wrong or if this error message keeps coming up 
how do i resolve it?