What are the 3rd party snapshots?
Third-Party snapshots are generated by a third-party backup tool over API calls to our storage. The Nutanix system does not manage this type of snapshots and will keep the snapshots until it receives a deletion instruction from the third-party tool.
The NCC health check aged_third_party_backup_snapshot_check checks the cluster for dangling third-party backup snapshots that may be present for a protection domain. If a third-party backup snapshot has existed in the system for longer than the specified period, this check will raise an alert. These backup snapshots are snapshots that are generated from 3rd party backups (Veeam, Commvault, Rubrik, HYCU, etc.).
The check passes if third-party backup snapshots are not present in the cluster longer than the configured threshold.
The default threshold is 7 days, but this threshold value can be modified. The threshold can range from 1 day to 365 days.
For more information, examples and solution check out KB-4273.