File not found error creating tar.bz2 archive

[Paul Mooring]

Just like the subject says, this...
paul at paulbox:~ $ sudo tar cjpf /backups/bkup/2010-02-11.tar.bz2
/home/paul/Desktop/
...gives me this...
tar: /backups/bkup/2010-02-11.tar.bz2: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
tar: Removing leading `/' from member names

I'm running it is as root so I don't think it's permissions but just in case...
paul at paulbox:~ $ ls -ld /backups
drwxrwxrwx 2 root root 48 Feb 11 13:12 /backups

anyone know what I'm doing wrong here?