How to determine if a backup or restore task is successful

[honobi]

When running clickhouse-backup create_remote in the background to create a backup to S3, how can I determine if a backup task was successful?
Similarly, when executing a restore in the background, how can I determine if the restore task was successful?

[Slach]

Exit code for cli usage

system.backup_actions polling for SQL interface
GET /backup/actions polling status field in REST API