Continuous Data Protection vs Scheduled Backups: Which Do You Need?
What Is Continuous Data Protection?
Continuous Data Protection (CDP) captures every change to your database in near real-time. Instead of periodic snapshots, CDP maintains a continuous stream of changes that allows point-in-time recovery to any moment.
For PostgreSQL, this is achieved through WAL (Write-Ahead Log) archiving. For MySQL, through binary log replication. For SQL Server, through transaction log shipping.
What Are Scheduled Backups?
Scheduled backups create periodic snapshots of your entire database. A full backup runs at a set interval (nightly, hourly) and captures the complete state of the database at that point in time.
Comparing the Approaches
| Factor | CDP | Scheduled Backups |
|---|---|---|
| RPO | Seconds to minutes | Hours (depends on schedule) |
| Storage cost | Higher (continuous stream) | Lower (periodic snapshots) |
| Complexity | Higher | Lower |
| Restore speed | Variable (replay required) | Predictable |
| Verification | Difficult to verify stream | Easy to verify full backup |
When to Use CDP
CDP is essential when your RPO requirements are measured in minutes or seconds:
- Financial transactions where losing even one transaction is unacceptable
- Real-time analytics where data freshness is critical
- Compliance requirements that mandate point-in-time recovery
When Scheduled Backups Are Sufficient
For most applications, scheduled backups provide adequate protection:
- Content management where losing a few hours of changes is acceptable
- Internal tools where RTO matters more than RPO
- Development and staging environments
The Best of Both Worlds
The optimal strategy combines both approaches:
- CDP for point-in-time recovery capability (WAL archiving, binlog replication)
- Scheduled full backups for independent, verified recovery points
- Automated verification to ensure scheduled backups are actually recoverable
CDP gives you granular recovery. Scheduled backups give you verified, independent snapshots. Together, they provide comprehensive protection.
BackupAgent handles the scheduled backup side: automated full backups with compression, encryption, cloud storage, and Docker sandbox verification. Combine it with your database engine's native CDP features for complete coverage.
Key Takeaway
CDP and scheduled backups are not competitors. They are complementary. Use CDP for granular recovery and scheduled backups with verification for guaranteed recovery points. The worst strategy is to rely on only one approach.