Mapped drive database backups

How would I schedule full database backups to backup to
another disk on a mapped shared network drive?
I have tried adding a disk dump device using
sp_addumpdevice. Then running the BACKUP DATABASE command
but I get the following error message:
Cannot open backup device 'pdmsdiskdump'. Device error or
device off-line.
Thanks,
Anjelina> How would I schedule full database backups to backup to
> another disk on a mapped shared network drive?
If you set up a mapped drive H: while logged in as user A, user A is the
only person who can see an H:!
Use \\UNCPath\, unless you have set SQL Server and agent to run as a domain
account with access to the share, and you set up the mapped drive while
logged in as that user.