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Hi there, please find the answers inline
(1) Is there any other possible option for disaster recovery that I haven't considered?
Currently those are the best options available for disaster recovery i.e
- Cross cluster replication
- Snapshot backup
- Multi-AZ domains and replica shards
- Configuring a multi-AZ domain in Amazon OpenSearch Service.
(2) For snapshot backup, is there an easy way to schedule/manage the backups, so we can bring up the domin in shortest period of time and with less data loss.
Yes you can automate taking manual snapshots using ISM (i) (ii), so that latest can be restored manually in to the new cluster.
Hope this helps!
References:
(i) https://opendistro.github.io/for-elasticsearch-docs/docs/im/ism/policies/#snapshot (ii) https://docs.aws.amazon.com/opensearch-service/latest/developerguide/managedomains-snapshots.html#managedomains-snapshot-ism
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