What is the role of an Administrator ?( Linux in perticular )

• With the power of administrator access comes responsibility. In other words, if something goes wrong, it's your butt on the line.
• Administrator tasks: managing users; installing, configuring, and upgrading hardware; installing, configuring, and upgrading software; backups; monitoring system activity (e.g. who's doing what, how is the OS performing); security configuration and monitoring; handling emergencies; contingency planning
• It's an all or nothing job. Don't accept an administrator role unless you are the only person in possession of the root password, or the others with the password are trusted administrators.
• As the administrator, you must always consider the ethical implications of your actions or inaction.
• The number one rule for backups is to test the restore operation frequently.
• Linux has no one recommended backup strategy, but tar does a fine job in most cases.
• Some complex applications, notably databases, require special handling of the backup process because they will lock files, or may have to be shut down to make a proper snapshot of the data.