A reinstall returns the system to a clean state according to the rebuild or deployment workflow available for your service. It is the right option when you need to start over, recover from a broken setup, or return the machine to a known baseline.
A reinstall should be treated as destructive unless the workflow explicitly says otherwise. Back up anything important before you proceed.
After the reinstall completes, expect to reconfigure the system, applications, access, and any automation tied to the old environment.