A virtual server that is hosting a legacy line-of-business application has been identified for a critical patch application. Which of the following should be performed prior to the patch?

Restarting the virtual server before a patch might be part of a maintenance window but does not provide a rollback mechanism if the patch fails.

Creating a snapshot of a virtual server captures its entire state, including disk, memory, and settings, at a specific point in time. This allows for quick and easy rollback to the pre-patch state if the critical patch causes instability or breaks the legacy application, minimizing downtime and risk during critical updates.

Creating an Open Virtualization Format (OVF) template is used for exporting and importing VMs, often for migration or archival, not for a quick rollback point before patching.

Creating a copy of important files is a good general backup practice, but a server snapshot provides a complete system-level rollback capability which is more comprehensive and faster than restoring individual files for a critical system patch.