Threat types:
1. Man-made
2. Natural
3. Technical
Strategy Risks:
1. Complexity is added with redundancy / fail over
+ Qualified staff
+ Budget
+ Compatibility
2. Need for protection at all layers
+ Data / Hard drive / clusters / Images / Zones / Networks etc
3. DR site may be geographically remote
+ Latency
+ Bandwidth
+ Regulatory compliance may vary across jurisdictions.