# "cron-like expression" in backup task

**URL:** <https://community.sonatype.com/t/cron-like-expression-in-backup-task/8153>\
**Category:** Sonatype Nexus Repository\
**Tags:** help, scheduled-task\
**Created:** [February 1, 2022, 6:56am UTC](https://community.sonatype.com/t/cron-like-expression-in-backup-task/8153 "2022-02-01T06:56:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![harald.dunkel](https://avatars.discourse-cdn.com/v4/letter/h/51bf81/32.png) [@harald.dunkel](https://community.sonatype.com/u/harald.dunkel)\
**Post date:** [February 1, 2022, 6:56am UTC](https://community.sonatype.com/t/cron-like-expression-in-backup-task/8153/1 "2022-02-01T06:56:08Z")

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I’m trying to configure “0 9,21 \* \* \*” as the time in a daily backup task, but it is not accepted. Even “0 21 \* \* \*”, “0 0 21 \* \* \*” or “0 0 21 \* \* \* \*” are not accepted. Everytime I get an error “Cron expression is invalid”. What would be a valid expression here?

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**Author:** ![mpiggott](https://avatars.discourse-cdn.com/v4/letter/m/f0a364/32.png) [@mpiggott](https://community.sonatype.com/u/mpiggott)\
**Post date:** [February 1, 2022, 8:26pm UTC](https://community.sonatype.com/t/cron-like-expression-in-backup-task/8153/2 "2022-02-01T20:26:20Z")

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The quartz scheduler uses its own cron format - [Cron Trigger Tutorial](http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html)