comptia-a-plus-core2/notes/OPS-3-backup-recovery.md

OPS-3: Backup and Recovery

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Domain:

• 4.0 Operational Procedures

Objective alignment:

• 4.3 Backup and recovery

What You Need To Know

Backups only matter if they can be restored.

Backup types:

• Full: backs up all selected data.
• Incremental: backs up changes since the last backup of any type.
• Differential: backs up changes since the last full backup.
• Synthetic full: builds a full backup from previous backup data.

Rotation concepts:

• Onsite and offsite
• Grandfather-father-son
• 3-2-1 rule

Restore options:

• Restore in place
• Restore to alternate location

Memory Trick

Use F-I-D-S:

• Full
• Incremental
• Differential
• Synthetic full

Shortcut:

• Backups are promises; restore tests prove them.

Exam Clues

• Incremental backups are small and fast but restore chains can be longer.
• Differential backups grow until the next full backup.
• 3-2-1 means three copies, two media types, one offsite copy.
• Test restores on a defined schedule.