Hide Import and Export From Site Admins
Removes Tools > Import and Tools > Export from subsite dashboards for non-super-admins and blocks the screens, keeping content moves in the network team's hands.
Snippet Library
Multisite snippets for WordPress
Snippets for WordPress Multisite networks: network-wide settings, new site defaults, super admin tools and cross-site tweaks. For network administrators who manage many sites from one install.