I have a Wordpress site on a Debian/Linux dedicated server, with a Backupbuddy plugin for making automatic backups.

The plugin, however, gives an error 'Your server does not support command line ZIP'.

My knowledge of Linux commands is very limited, but I managed installing zip with the command sudo apt-get install zip

However, I still get the same error message. Plugin documentation mentions the problem could also be caused by disabled exec() or safe_mode - but exec isn't disabled, and safe_mode is off.

Any ideas what might be causing this, or how to fix it? The only thing I could think of, is it might be caused by wrong permissions?