text: Sto rage 
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  *Figure 10-2 Data, resource, and index storage and expiration scenarios*
  
  **Scenario 1: Cache only, then expiration**
  In this scenario, the storage object is stored to cache only and it is expired from cache after a 
  predetermined period. Typically, this methodology is employed under the following 
  circumstances: 
  
  (cid:2) The life of the data is short, and hierarchical storage management (HSM) is not necessary. 
  (cid:2) The life of the data is long, and a backup process exists for the data in cache. 
  (cid:2) The cache device is large enough to hold the total archived data, and the cache device is 
  reliable and performs well. 
  
  This method is enabled by selecting a cache-only storage set and entering a number in the 
  Cache Data for__Days field. 
  
  When you select a cache-only storage set, Content Manager OnDemand automatically sets 
  Migrate Data from Cache to No and sets the Expire in__Days field to the same value as the 
  Cache Data for__Days field. (The default value is 90 days.) 
  
  Selecting a cache-only storage set requires the creation of backup and data management 
  systems that are external to the Content Manager OnDemand system. 