For optimistic concurrency control. See {@code if-match}.
Flag to indicate whether or not the object was modified. If this is true, the getter for the object itself will return null. Callers should check this if they specified one of the request params that might result in a conditional response (like 'if-match'/'if-none-match').
Unique Oracle-assigned identifier for the request. If you need to contact Oracle about a particular request, please provide the request ID.
The returned model.Backup instance, or null if {@link #isNotModified()} is true.