MODX version tagged when creating the issue, Apache or NGINX with version, MySQL version, browser, etc. Any relevant information.
MODX 2.7.1, MySql 5.6.43, Chrome 73.0.3683.86
I just installed it to try and replicate your issue. I don’t get the same error, but the backup zip that it creates doesn’t contain a database (even though it was ticked) and the download buttons fail when trying to download the backup to a local machine.