Please follow steps in NBU for Microsoft SQL Server Admin Guide .
Look for topic called: Redirecting a restore to a different host.
Step 1 is done on master server. Creating No.Restrictions file is the easiest.
Step 2 onwards is done on Destination Client (WIN26).
Also read this section in the same manual: Minimizing timeout failures on large database restores.
Be sure to create log folders before you start. This is the only way to troubleshoot failures:
On master: bprd (NBU needs to be restarted to enable bprd logging)
On media server: bpbrm and bptm (no restart needed)
On destination client: (bpcd and dbclient)