A library catalog must meet a stated RTO in a second Region while keeping costs lower than active-active multi-site. Which DR pattern fits best?
Select an answer to reveal the explanation.
Short Explanation
Warm standby is a smaller branch library kept open with fewer clerks—you staff up when the main branch floods. It hits RTO without paying for two full active-active catalogs. Annual tapes or one AZ won’t meet a real second-Region RTO.
Full Explanation
Warm standby runs a functional but reduced-capacity environment in a standby Region and scales out during failover, balancing RTO against the higher continuous cost of multi-site active-active. Active-active duplicates full production spend; backup/restore and single-AZ designs typically miss Region-level RTO targets. For the library catalog, warm standby is the cost-conscious pattern that still meets the stated RTO.