BDR

BDR is the Acronym for Backup and Disaster Recovery

A comprehensive IT strategy that integrates the routine duplication of data with a predefined set of procedures to restore IT infrastructure following a disruptive event. While Backup focuses on data redundancy and preservation, Disaster Recovery focuses on the processes and technologies required to restore system functionality.

Key Performance Indicators (KPIs)

Recovery Point Objective (RPO): The maximum age of files that must be recovered from backup storage for normal operations to resume. It defines the acceptable amount of data loss measured in time (e.g., a 1-hour RPO requires backups every hour).
Recovery Time Objective (RTO): The duration of time within which a business process must be restored after a disaster to avoid unacceptable consequences associated with a break in continuity.

Data Redundancy Frameworks

3-2-1 Strategy: A foundational data protection principle requiring three copies of data, stored on two different media types, with at least one copy located offsite.
Immutable Backup: A backup file that cannot be altered, encrypted, or deleted for a set duration. This is a primary defense against ransomware (cryptojacking).
Air Gapping: A security measure that ensures a backup copy is physically or logically isolated from any network connection, preventing remote unauthorized access.

Disaster Recovery Operations

Failover: The operational mode of switching from a primary system to a secondary, redundant system (often in the cloud or a secondary data center) upon the failure of the primary.
Failback: The process of synchronizing data changes back to the primary site and restoring original operations once the failure has been remediated.
Point-in-Time Recovery (PITR): The ability to restore a database or system to a specific second in time, typically achieved through continuous data protection (CDP) or frequent snapshotting.

Recovery Site Classifications

Type	Description	Readiness
Hot Site	A mirrored data center with real-time data synchronization.	Near-instantaneous recovery.
Warm Site	A facility with hardware and network connectivity; requires data restoration from backups.	Recovery within hours/days.
Cold Site	Physical space with power and cooling but no pre-installed hardware.	Longest recovery time (days/weeks).