Server to server file copy security without domain trust

So I have two servers A and B.

Server A is a production database server that lives in a remote data centre, has an IP address of 192.168.1.22 and belongs to domain "prodDom".  ProdUser is a login on the domain with permissions to read the backup file location.

Server B is a backup NAS server that lives local data data centre and belongs to domain "officeDom".

There is a site to site VPN between the sites, but the servers belong to different unrelated domains that have no trust relationship.  Server A produces a backup file each day that I need to copy to Server B but Server B does not have file share permissions to read from Server A without explicitly setting them.


Set LogFile="d:\backupCopy.log"

net use \\192.168.1.22\BakShare password /user:prodDom\prodUser /PERSISTENT:YES > %LogFile%
net use >> %LogFile%
whoami >> %LogFile%

Set Source=\\192.168.1.22\BakShare
Set Dest=d:\backups

Robocopy "%Source%" "%Dest%" /R:10 /IPG:10 /MIR >> %LogFile%


Robocopy notes:

/R:10 reduces the number of retry from the high default value - this means that the script will not get stuck in a loop for hours and hours

/IPG:10 causes a 10ms delay between each packet.  It's by no means a guarentee, but I've typically seen this throttle the network usage on a copy job to around 30% of a 100mb/s lan connection.