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CIS 527

Lecture 25 - Backup Strategies

Backups

Image Source: walkn on Flickr

Backup Strategies

Backup Strategies

Who Owns the Data

What data must be Stored

When backups should be made

Where backups should be stored

Where backups should be stored

Where backups should be stored

Where backups should be stored

Where backups should be stored

Source: Wikipedia

Why data loss occurs

How should it be created?

Source: Wikipedia

Unstructured

"Just a pile of CDs"

Full Image

Contains a complete copy of all files

Incremental

Only store changes since last full/incremental backup

Differential

Only store changes since last full backup

Reverse Delta

Most recent backup is a full; all previous versions are based on most recent

Comparison

Day Incremental Differential
Sun Full Full
Mon Since Sun Since Sun
Tue Since Mon Since Sun
Wed Since Tues Since Sun
Thu Since Wed Since Sun
Fri Since Thu Since Sun
Sat Since Fri Since Sun

Continuous

Instantly back-up any changes made

Objectives vs. Limitations

Objectives:

Source: Wikipedia

RPO & RTO Example

Image Source: Wikipedia

Objectives vs. Limitations

Limitations:

Source: Wikipedia

High Availability

Image Source: Wikipedia

Assignments