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19.You have been asked by your management to come up with a backup solution that covers not only data loss, but also situations where the entire system, or building, is destroyed. Your solution should also protect against data theft. Which of the following plans provides the most secure redundant backup and storage solution?

Once a week, all of your systems receive a full system backup to tape. Those tapes are stored in a secured location in your facility.
Once a week, all of your systems receive an incremental system backup to tape. Those tapes are stored in a secured location in remote facility.
Every night, all of your systems receive an incremental system backup to tape. Those tapes are stored in a secured location in a remote facility.
Every night, all of your systems receive an incremental system backup to tape, and once a month, all systems receive a full backup to tape. Those tapes are stored in a secured remote facility.
Once a week, all of your systems receive a full backup to tape. Twice a month, all of your systems receive a full backup to CD. The tapes are stored in a secured remote facility. The CD's are stored locally.

Explanation: Your backup strategy should allow for backups to occur as often as possible. Daily backups are recommended but this isn't always possible because the amount of time a full backup would take. For this reason, daily incremental backups are recommended. An incremental backup will only backup the files that have been created or changed since the last backup, thus saving time and backup media space. You should however perform full backups on a regular basis (monthly is recommended). This will allow the easy restoration of a failed system. The backup tapes should be stored in a secured remote facility, in case the building is destroyed.

Incorrect Answers
A: If you back up the files once a week, you could lose up to one week's data. For this reason, daily backups are recommended.
B: If you back up the files once a week, you could lose up to one week's data. For this reason, daily backups are recommended.
C: You should perform full backups on a regular basis (monthly is recommended). This will allow the easy restoration of a failed system.
E: If you back up the files once a week, you could lose up to one week's data. For this reason, daily backups are recommended.
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