Hey guys I've a question.

This is i know we can create forwarding destination in qradar. what are the specifications of machine at destination site (hardware specs and qradar software version should be.

e.g. should the destination site must have same hardware specs as the source site? what about the versions of both qradar?

I do not see any hardware spec requirement for forwarding events/flows. But as far as version is concerned, Newer versions of QRadar systems can receive data from earlier versions of QRadar systems. However, earlier versions cannot receive data from later versions. Ref: https://www.ibm.com/docs/en/qsip/7.4?topic=center-event-flow-forwarding-configuration