| 摘要 |
A history of locations of tenant data is maintained. The tenant data comprises data that is currently being used by the tenant and the corresponding backup data. When a tenant's data is changed from one location to another, a location and a time is stored within the history that may be accessed to determine a location of the tenant's data at a specified time. Different operations trigger a storing of a location/time within the history. Generally, an operation that changes a location of the tenant's data triggers the storing of the location within the history (e.g. upgrade of farm, move of tenant, adding a tenant, load balancing of the data, and the like). When tenant data is needed for an operation (e.g. restore), the history may be accessed to determine the location of the data.
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