NetApp HCI backups are based on volume snapshots. If a Netapp HCI snapshot is scheduled to run at a time period that is not divisible by 5 minutes, the snapshot will run at the next time period that is divisible by 5 minutes. You cannot schedule a snapshot to run at intervals of less than 5 minutes.
NetApp, NetApp HCI [HCI]/1.8 P1, x86
Backup Frequency, Points-in-Time, Data Availability