Having a DR Disaster Recovery plan and being able to underpin some data retention policies are often mandatory. The bad thing is I did not see SAS is recognizing that.
It is requiring good cooperation with the OS as it should be solved there. A metadata server backup is no backup but better described as an offloaded version.
In your grid environment you have some shared or duplicated data. When it is fully clustered spread over different locations you can say DR is implemented, but you will still need versions being backupped/covered.
The standard way today is incremental backups. The disadvantage will be very long restoration times. This policy is a dogma but not necessarily the only technical option.
Those guys just do not tell everything.
---->-- ja karman --<-----