The external Elasticsearch is backed up by making requests to a preconfigured repository.

API Gateway backups are snapshots of data taken incrementally. This backup process only copies data to the repository that was not already copied by an earlier snapshot, avoiding unnecessary duplication of work or storage space. Hence, you can safely take snapshots very frequently with minimal overhead. For example, if you create backup files daily, the backup file you create has only the data that has undergone change and the data created since your last backup, that is the previous day.

This process of incrementing the data with snapshots only applies within a single repository because no data is shared between repositories.