Sonora Communications, Inc.

These notes outline a simple two-level multi-level backup system that we commonly use for small business clients.

We refer to a Level 1 backup system that uses a local hard disk to back up server data.

We refer to a Level 2 backup system as an on-line backup service for off-site and/or long term storage.

We rarely install tape backup systems these days as the newer disk-based systems are much more reliable and are usually much less expensive. However, there are circumstances where tape-based backup is called for, for example in scenarios where a customer has a large amount of data that changes frequently (think video production). This scenario is not optimal for on-line backup due to the speed of the typical Internet connection.

• Typical Storage and Backup Scenario
  • RAID 1 (mirrored) or RAID 5 redundant primary storage
  • Automated level 1 backup
  • Automated level 2 backup

• Level 1 Backup
  • Uses extra local hard disk
    • Fast backups
    • Backs up everything
    • Inexpensive hardware
    • Minimal 'backup window' required
    • Fast and convenient restores
    • Disaster recovery capable
    • Automated
    • No monthly cost

• Level 2 Backup
  • Uses on-line backup service
    • Slower than level 1
    • May not back up absolutely everything due to monthly cost
    • Off-site storage in a secure data center
    • No extra hardware required
    • Uses Internet connection during off-hours
    • Automated
    • Secure, encrypted connections
    • Business survives even if server and L1 backup devices are stolen or destroyed