1. A system, comprising: a critical partitioned dataset extended (PDSE) stored to memory of the system; logic adapted for protecting the critical PDSE by creating a copy of the critical PDSE, referred to as a PDSE copy; logic adapted for providing a critical dataset redundancy (CDR) task with exclusive access to the PDSE copy; logic adapted for initiating a transaction queue for tracking updates to the critical PDSE; logic adapted for adding any updates performed to the critical PDSE to the transaction queue; logic adapted for updating the PDSE copy according to the transaction queue; logic adapted for quiescing the critical PDSE; logic adapted for corralling a plurality of open connections to the critical PDSE in response to the quiescing; logic adapted for completing each of one or more updates resident in the transaction queue to bring the PDSE copy up to a last known uncorrupted state of the critical PDSE; logic adapted for providing a replacement critical PDSE by redirecting the corralled connections to the PDSE copy; logic adapted for protecting the replacement critical PDSE by creating a copy of the replacement critical PDSE, referred to as a replacement PDSE copy; and logic adapted for providing the CDR task with exclusive access to the replacement PDSE copy.