Backup docs: clarify that both ID and DB backups are recommended (#3464)

Patch contributed by @amarqueslee-da

[static]

Signed-off-by: Martin Florian <martin.florian@digitalasset.com>

Author: martinflorian-da

docs/src/validator_operator/validator_backups.rst

@@ -11,9 +11,12 @@ Backups
 While all components in the system are designed to be crash-fault-tolerant,
 there is always a chance of failures from which the system cannot immediately
 recover, e.g. due to misconfiguration or bugs. In such cases, you will need to
-restore a component or the a full validator node from
+restore a component or a full validator node from
 backups or from dumps of the components that are still operational.
 
+Node operators should take **both** Node Identity backups and Postgres Instance
+Backups to protect their node from the widest range of disaster scenarios.
+
 .. _validator-identities-backup:
 
 Backup of Node Identities