Backup a remote database, from my machine, to another server (SQL Server 2008)

I'm trying to backup a database, of a remote server, from my machine, to another server.

 SERVER1   >>>  BACKUPSERVER
      \             /
       \           /   
        \         /
         My Machine 

I have SERVER1 with some databases. I'm connected on it from my machine, and I'm using:

BACKUP DATABASE X 
TO DISK ='BACKUPSERVER\Database.bak'

And I'm getting this error:

Msg 3201, Level 16, State 1, Line 1

Cannot open backup device 'BACKUPSERVER\BACKUP LOCAL'.

Operating system error 1265(The system detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you.).

OBS: I will not change anything, because I contact the guys from infrastructure, and told them to change the Service Login (just to test), and they told me that they will migrate this server to another one and I should not be worried about it (I'm DBA jr, so I'm learning the server maping from here).

But I'm curious about that error. And if a face this again, how could I solve it?

Thanks guys.