hi,

I dont think, it would be an issue to backup the database from the server to the san filer directly.

I too get some times the OS error 64, but the only thing we need to look into it is, the filer should be allways available 24*7. If there is a disconnection between the filer and backup plan even for 1 sec, when backup is running we will run out of the issue.

The other factors is to consider the backup to run in local drive, due to time delay for the backup job to complete.