use command:
checkpoint auto 3

the following messages is coming before end of time:
WARNING Please "checkpoint auto confirm" within 2 minutes

info from HPE page (see link below):

To save the runtime checkpoint permanently, run the checkpoint auto confirm command during the time lapse value set by the checkpoint auto <TIME-LAPSE-INTERVAL> command. The generated checkpoint name will be in the format AUTO<YYYYMMDDHHMMSS>. If the checkpoint auto confirm command is not entered during the specified time lapse interval, the previous runtime configuration is restored.

see also:

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