I change all the db2 services from using a SYSTEM account to a account with admin authority. This account should be an administrator and should have the advanced rights 'act as part of the operating system', 'create a token object' and 'replace a process token level'. "
It still wasnt working.
After that I changed the path to fully qualified network path (like \\network\path), rather than just "backup to Y:\...".
and it worked like a charm....
thanks for your help..