In order to provide the granular search and restore functions, the data is unencrypted temporarily to build the search index. Once the index is built, both the data and the index are encrypted. By default, Index all data for Search check box is checked and your archives will be indexed for use in the granular search and restore function. If you want to uncheck the Index all data for Search you will need to contact email@example.com. This will disable the granular search and restore function but you can still browse backups via date.