https://cloud.ibm.com/docs/services/Cloudant?topic=cloudant-ibm-cloudant-backup-and-recovery

The CouchBackup tools have the following limitations:

_securitysettings are not backed up by the tools.

Attachments are not backed up by the tools.

Backups are not precisely accurate 'point-in-time' snapshots. The reason is that the documents in the database are retrieved in batches, but other applications might be updating documents at the same time. Therefore, the data in the database can change between the times when the first and last batches are read.

Index definitions that are held in design documents are backed up, but the content of indexes is not backed up. This limitation means that when data is restored, the indexes must be rebuilt. The rebuilding might take a considerable amount of time, depending on how much data is restored.