1. Backing Up a Hard Disk CGS2564

2. Why Backup Programs? Faster Optimized to copy files Can specify only files that have changed Safer Can verify backed up data Can save job settings Which folders to backup Type of backup Can schedule backups for any time Support for many media types Save disk space Store many files as one (less slack) Data compression

3. Organizing Files for Backup Separate important data files for backup Separate further by backup frequency

4. Backup Types Normal Backup all selected data Turns off archive attribute Differential Backup only changed and new files Incremental Backup only changed and new files

5. Differential Backs up all changed and new files since last normal backup even if backed up before Does not turn off archive attribute Normally only keep one backup set and keep replacing that

6. Differential Backup

7. Incremental Backs up all changed and new files since last normal or incremental backup Does turn off archive attribute Normally keep each copy of backup set

8. Incremental Backup

9. Differential vs. Incremental Differential Backup operation takes longer (more files) Easier to restore (only one backup set to restore) Less flexible (only the most recent version of files)

10. Differential Backup

11. Differential vs. Incremental Differential Backup operation takes longer (more files) Easier to restore (only one backup set to restore) Less flexible (only the most recent version of files) Incremental Backup operation faster (fewer files) Harder to restore (multiple backup sets to restore) More flexible (have several recent versions of files)

12. Incremental Backup

13. Backup Program Files Create a proprietary file format Must use that program to restore files Might need to keep old backup program to restore archived data