====== Multi-Level Backup System ======

These notes pertain to a multiple-level backup system.  We are referring to a backup system that uses local storage (usually an internal or external hard disk) to back up server data in conjunction with an on-line backup service for off-site storage.

  * **Typical Scenario**
     * Software RAID 5 for primary storage
     * Separate hard drive for backups
     * Hard drive only mounted during backup
  * **Level 1 Backup**
     * Uses local hard disk
        * Fast backups
        * Minimal 'backup window' (time) required
        * Fast and convenient restores
        * Disaster recovery
  * **Level 2 Backup**
     * Uses on-line backup service
        * Slower than level 1
        * Off-site storage
        * No hardware required