Content download is performed only when the content strategy is Store all items. Vault Cache synchronization downloads the content of items from the online archive to the Vault Cache. After the initial Vault Cache synchronization, content download can be minimized by preemptive caching. You can determine the age of items on which to perform preemptive caching, using the Vault Cache advanced setting Preemptive archiving in advance.

See Preemptive caching.

If the content strategy is Store only items that user opens, an item's content is downloaded immediately when the user opens the item. The content is then stored in Vault Cache for later use.