A company or organization’s emails are not just a record of what car left its headlights on or whose birthday it is. Emails also contain a critical record of decisions, agreements, conversations and data. Protecting this information carries both legal and commercial obligations, and requires careful planning.
When you back up an Exchange Server using VSS, the Exchange VSS writer will work to improve the shadow copy and make it application consistent. If the Exchange VSS writer is not enabled, you will not have an application consistent shadow copy, and your backup job may encounter errors.