Backing up to NAS - "network name is no longer available" Error

I'm backing up four databases to a NAS device on a nightly basis. All but
the largest db (which is 7GB) backup successfuly. The error in the SQL
Server log is:
"BackupDiskFile::RequestDurableMedia: failure on backup device" followed by
"Operating system error 64(The specified network name is no longer
available.)." I thank you in advance for your help!
Eric,
I am having the same problem with my backup routine (SQL2k). However, the
only difference is I'm backing up to a windows 2000 box with 200GB hard
drives instead of a NAS.
"Eric" <Eric@.discussions.microsoft.com> wrote in message
news:9D214833-BD20-4FCD-8983-60F627F79475@.microsoft.com...
> I'm backing up four databases to a NAS device on a nightly basis. All but
> the largest db (which is 7GB) backup successfuly. The error in the SQL
> Server log is:
> "BackupDiskFile::RequestDurableMedia: failure on backup device" followed
by
> "Operating system error 64(The specified network name is no longer
> available.)." I thank you in advance for your help!