I have a multisite wp installation in a subdirectory. I also have another CMS installed in the root directory. Different databases.
I wonder a bit about the automatic upgrade that's available inside wp-admin. It seems to work alright when testing but I would like to limit or help wordpress to only access the installation folder. I read about FTP_BASE in wp-settings but not quite sure this is it.
What are the risks with automatic upgrade, in meaning of effecting root content?
How does the upgrade know to target the wp-installation folder?
Is there any known cases with automatic upgrades that totally ruined some non-wp content?