Overview

Two site protection combines snapshots for quick local recovery with replication or backup to a second NAS for offsite resilience.

Replication options and when to use them

Pick the tool that matches your data and recovery goals.

• Snapshot Replication for fast point in time rollback between compatible models
• Hyper Backup for versioned backups with deduplication and flexible destinations
• Combine both when you need fast local rollback and long term offsite retention

Network and bandwidth planning

Keep replication windows predictable and avoid saturating links.

• Use a business grade link or scheduled windows for large deltas
• Enable compression where supported and appropriate
• Consider seed copies sent by drive for very large datasets

Security and access control

Keep offsite devices locked down and access auditable.

• Use unique accounts and strong passwords on both NAS units
• Restrict firewall rules to required ports and addresses
• Enable encryption on backup repositories and protect keys

Setup steps

Create clean, documented links between primary and secondary NAS.

• Update DSM on both sides and confirm time sync
• Create replication or backup tasks by dataset
• Schedule jobs and verify the first run completes
• Enable alerts and reports for failures

Failover and restore drills

Practice makes real incidents less stressful.

• Document failover steps for each critical dataset
• Run quarterly restore or takeover drills
• Review results and adjust schedules or capacity

Operations and monitoring

Light routines keep protection healthy.

• Review job reports and capacity monthly
• Rotate credentials on a schedule
• Replace aging drives proactively and keep a spare on hand

FAQs

Helpful clarifications for two site plans.

• Do both NAS units need to match? It helps for Snapshot Replication, Hyper Backup is more flexible
• Can I replicate over the internet? Yes with proper security and scheduling
• Should I also keep a cloud copy? Yes for disaster scenarios that affect both sites