> However, to prevent some users from saving in the
> system partition, we must manage the "base path".

They'll still be able to inject additional options (-O <path> for example), so
this won't be safe anyway.

The best way in my opinion would be to create a dedicated user (such as
"httrack" or "mirror") ; for example by using adduer/useradd, or by editing
/etc/passwd, and only allow one specific directory to be writable by this
user.