DB backups for production to DR without creating jobs in prod

I had two servers(SQL 2005) A and B. B is Production server and A is DR. I want to take backups for B server databases from A server. We can not create any maintenance plans or jobs in B production server. We can create any jobs in DR server to take backups for Prod server. Is it possible? both are in different domain. If the servers are in same domain is it possible? and please send the procedure.

Please help me asap.