According to this..
I got a Jira backup file which named JIRA-backup-25-03-2021.zip
The question is how to restore the backup file to JIRA?
The "Import and Export" menu (where the backup manager is located), has the "Restore system" heading. This allows you to restore such a backup.
Be careful, as restoring a backup will overwrite all data in your current Jira Cloud instance.
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