Hi @CraigWeb , actually I was trying to install a new Mango 5 instance. Everything is totally new. These are what I did:
1/ Install MySQL 8.0, create a database (scheme) named mango
2/ Install Mango 5 and paste a mango.properties file with MySQL info as above mentioned in mango_data folder.
3/ Start mango service and change admin password.
4/ Create a data source with some data point.
5/ Backup with Backup feature in System Setting -> SQL backup
6/ Delete data source and restore with System Setting -> SQL backup.
7/ See that orange warning pop up, but the deleted data source and data point is back, but I'm not sure if it normal or not.