Hi,
We plan to migrate our project's Jira (free Cloud) to a Jira Server hosted by our Company.
As a first step, we did a full Backup for Cloud (for safety reasons, not for the migration) and it worked perfectly.
Then, we tried to do a full export with the Backup to server feature of the System > backup Manager.
We have a single project and it is not a next-gen project (we created one once to test but deleted it afterwards). The system does not allow us to run the export: the Create backup for server button is disabled...

We tried Delete all next-gen projects a couple times to no avail. The operation seems to succeed but the button remains disabled.
Any idea ?