RPO(Recovery Point Objective) is focus on the loss of data;

RTO(Recovery Time Objective) is focus on the loss of service.

Some solutions for disaster recovery：

1.Disk array copy technology(EMC SRDF,IBM PPRC,HP BusinessCopy,HDS TrueCopy);

2.Storage volume copy technology(Veritas VVR);

3.Datatabase copy technology(DSG RealSync,Quest SharePlex);

4.Application copy technology.

You should pay attention to three key considerations:

TCO(Total Cost of the Ownership)

ROI(Return On Investment)

BCM(Business Continuity Management)

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Make notes for disaster recovery