Hello Irek,
Could you please provide a screenshot of the behaviour you observe when creating a backup of your Jira Cloud instance please?
In my own opinion, your issue can be related to a timeout on your browser. So, if you don't mind using scripts, there are some scripts on Atlassian Labs' Bitbucket repo which can help you to create and download Confluence and Jira backups: https://bitbucket.org/atlassianlabs/automatic-cloud-backup/src/master/
Thanks
Boris
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