Hi @adil ,
To prepare a Business Continuity Plan for SharePoint 2019 on premise, you should follow the stages involved in planning for backup and recovery as described in the "Plan for backup and recovery in SharePoint Server" article. These stages include determining backup and recovery strategies for a SharePoint Server environment, deciding which tools to use, and considering common events, failures, and errors; local emergencies; and regional emergencies. You should also consider the four aspects of business continuity planning, which are assessment, planning, capability validation, and communication and coordination, as described in the "Developing your business continuity plan" article. It is critical that the location of your Business Continuity Plans and Standard Operating Procedures is well known, and you should maintain online and offline copies of critical documentation, such as with SharePoint Online or OneDrive for Business configured for automatic sync to local devices. For Service/Network Operations Centers and other similar teams that will be critical for recovery, you may also want to keep hard copies available to be used in case event of an emergency.
Hope this helps.
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