Instant Restore is a feature that provides the instant restoration function for restoring ECS data, which is much faster than the normal restoration function.
Backups generated before the Instant Restore feature is enabled do not support instant restoration. To use the feature, perform a full backup operation and select Enable next to Full Backup when creating the backup. For details, see Creating a CSBS Backup. After Instant Restore is enabled, manual backups for ECSs that have not been backed up automatically support instant restoration, without requiring the selection of Enable next to Full Backup.
No matter whether an ECS has been backup or not, its automatic backups generated after Instant Restore is enabled do not support instant restoration, unless you manually perform a full backup on it.
Backups whose backup type is Common backup do not support instant restoration. Backups whose backup type is Enhanced backup support instant restoration.