Create a user (john) as an administrator and assigned only the news page, not as superadmin ..
but then enter with this account (john)
and !!! You can download the database (backup )!!!!!!!!! and
! Edit in the menu navigator!
and! addon chat reset!
the rest is OK ..

Database? It can be restricted in admin > administrators > privs

For other installed pages, cannot be restricted. We're talking about an admin, he must be a trusted person obviously, other people can use the submission page.

admin > administrator> jhon>priv
only news page checked..
not superadmin
but it can access to System>database >backup and more

i'll check for the database, but installed addons cannot be, as i already said, cannot be restricted

oka thanks for your time