I have an issue with only one child site. It became disconnected and would not reconnect, so I re-added the site to MainWP. That works.
I attempt to install BackWPup and copy settings during the add process and it fails with the error message “Installation failed(Error while installing)”. However, the plugin is actually installed and activated on the child site, but the settings are not copied (i.e. the existing backup jobs are not loaded).
If I go to Extensions > BackWPup > Jobs and edit a job, every child site updates accordingly, except for this one site. It shows a red ‘X’ and TWO duplicates of the backup job are set up on the child site. I delete one, edit a job again from the dashboard site, and two more copies of the job are added to this child site.
I’ve tried deleting the site from the dashboard, deleting BackWPup and the MainWP plugins from the child site then setting it up again from scratch and the same thing occurs.
There are no problems with the other child sites.