Below is an explanation of what's going on followed by a TechNote for reference. Basically you need to do 2 things
1). Create a separate job for the SNAP server
2). Create a User Defined Selection and select the server for backup from there
How to create a user-defined selection in Backup Exec for Windows Servers
Details
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This issue has been discovered with Network Appliance devices, although it may occur during the backup of any NAS device that closely mimics Windows network sharing.
Because Backup Exec (tm) expects a Remote Agent to be installed on every Windows server, this can confuse Backup Exec into giving an error message stating that the Remote Agent is not present during backups.
Although the job is listed as "FAILED," the backup itself is not affected by this issue. As a workaround, it is recommended to separate the NAS device into its own backup job, so that the failed job status will not affect any other backup operations OR in case you do not want to create a separate job for the \\SNAP server you can prevent this error from the job log by purchasing and registering the Remote Agent for Windows Servers (RAWS)/ Remote Agent for NT (RANT) license on the media server. (Basically this is an licensing error because for Backup Exec, it is just another Windows server on the network).
NOTE: While backing up the <SNAP> server, Backup Exec software will treat it as another Windows server on the network and thus demand "RAWS/RANT" but no component is required (infact cannot be installed).The selections for the <SNAP> server backup need to be created through user-defined selections.