unfortunately, a deleted issue/board/etc. can only be restored through a backup BUT a board is only a visual representation of a filter. So you should be able to rebuild it quite easily. But you cannot restore it.
First of all, do you have a backup? Maybe it's a smart move to spin up a separate machine and Jira instance using that backup and then to rebuild the board. Better than overwriting your production instance with a backup and losing any changes made until now. :)
hey @dharan kumar
excuse me please, I totally missed the cloud label yesterday. Cloud's a different deal in terms of backups because you have no direct access to the infrastructure and system itself. But even you have possibilities to make backups: For example, this article is a good read: How to Automate Backups for JIRA Cloud applications
And more importantly please have a look at this document which explains backups in Atlassian cloud applications:
Backups are generated daily and retained for 30 days to allow for point-in-time data restoration.
You can also generate an offline backup of your Jira or Confluence Cloud site once every 48 hours. Atlassian maintains these backups on your behalf for 7 days.
But long story short, there's no real help possible right now unless you want to restore the whole instance through Atlassian support and lose data. :/ Rebuilt the board, be careful with administrative rights and train your users.
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