updated business continuity

Author: jovanpop-msft

articles/sql-database/sql-database-business-continuity.md

@@ -16,7 +16,7 @@ ms.reviewer: carlrab
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 # Overview of business continuity with Azure SQL Database
 
-Azure SQL Database is an implementation of the latest stable SQL Server Database Engine configured and optimized for Azure cloud environment that provides [high availability](sql-database-high-availability.md) and resiliency to the errors that might affect your business process. In the most of the cases, Azure SQL Database will handle the disruptive events that might happen in the cloud environment and keep your business processes running. However, there are some disruptive events that cannot be handled by SQL Database such as:
+Azure SQL Database is an implementation of the latest stable SQL Server Database Engine configured and optimized for Azure cloud environment that provides [high availability](sql-database-high-availability.md) and resiliency to the errors that might affect your business process. **Business continuity** in Azure SQL Database refers to the mechanisms, policies and procedures that enable a business to continue operating in the face of disruption, particularly to its computing infrastructure.  In the most of the cases, Azure SQL Database will handle the disruptive events that might happen in the cloud environment and keep your business processes running. However, there are some disruptive events that cannot be handled by SQL Database such as:
  - User accidentally deleted or updated a row in a table.
  - Malicious attacker succeeded to delete data or drop a database.
  - Earthquake caused a power outage and temporary disabled data-center.
@@ -27,7 +27,13 @@ This overview describes the capabilities that Azure SQL Database provides for bu
 
 ## SQL Database features that you can use to provide business continuity
 
-SQL Database provides several business continuity features, including automated backups and optional database replication. First, you need to understand how SQL Database [high availability architecture](sql-database-high-availability.md) provides 99.99% availability and resiliency to some disruptive events that might affect your business process.
+From a database perspective, there are four major potential disruption scenarios:
+- **Local hardware or software failures** affecting the database node such as a disk-drive failure.
+- **Data corruption or deletion** - typically caused by an application bug or human error.  Such failures are intrinsically application-specific and cannot as a rule be detected or mitigated automatically by the infrastructure.
+- **Datacenter outage**, possibly caused by a natural disaster.  This scenario requires some level of geo-redundancy with application failover to an alternate datacenter.
+- **Upgrade or maintenance errors** – unanticipated issues that occur during planned upgrades or maintenance to an application or database may require rapid rollback to a prior database state.
+
+SQL Database provides several business continuity features, including automated backups and optional database replication that can mitigate these scenarios. First, you need to understand how SQL Database [high availability architecture](sql-database-high-availability.md) provides 99.99% availability and resiliency to some disruptive events that might affect your business process.
 Then, you can learn about the additional mechanisms that you can use to recover from the disruptive events that cannot be handled by SQL Database high availability architecture, such as:
  - [Temporal tables](sql-database-temporal-tables.md) enable you to restore row versions from any point in time.
  - [Built-in automated backups](sql-database-automated-backups.md) and [Point in Time Restore](sql-database-recovery-using-backups.md#point-in-time-restore) enables you to restore complete database to some point in time within the last 35 days.