Deonet Backup Solutions 5.2.7.0

Better Edge Backup v5.2

User Guide

Page 56 of 121 (September 16, 2008)

All delta files are generated with respect to changes made since the last incremental or full backup. This mean s

that the last full backup file and ALL incremen tal delta backup files are required to restore the latest snap shot of a

backup file.

Differential in-file delta type

Differential Delta will f acilitate ease of restore. The delta is generated by comparing with the latest uploaded full

file. The delta file generated grows daily and uses more bandwidth d uring backup. For restoration, the full file and

a single delta file is required to restore the file to a specific point-in-time.

Example: If you are adding around 100MB chang es to a 10G Outlook.pst everyday.

After the first full b ackup job, Better Edge Ba ckup will continue to generate and upload delta files instead of

uploading the full file until either one of th e following two rules are true:

c) Number of deltas generated since the last fu ll backup is greater than the [Number of Delta] setting.

d) The delta ratio (the ratio of the delta f ile size against the full file size) is greater t han the [Delta Ratio]

setting

Using diff erential delta, the delta gene rated by comparing the current file with the latest uploaded full file is

around 100MB for the 1

delta, 200MB for the 2

delta, 300MB for the 3

delta and so on.

Since the delta file grows by 100MB daily, the delta ratio for day 52 (delta file size is approximately 51x100=

5.1GB, assuming the full f ile was uploaded on day 1) being over 50% exceeds the [Delta Ratio] setting and

triggers the upload of the full Outlook.pst file. You can disable the [Number of Delta] and [Delta Ratio] i f you don’t

want to upload the full file.

All delta files are generated with respect to changes made since the last full backup file (i.e. differential back up).

This means tha t only last full backup file and the last delta file are required to restore the lat est snapshot of a

backup file. This means that other intermediate delta files are only required if you want to restore other snapshots

of a backup file.

Differential in-file delta backu p has the benefits that a corrupted delta file would only mak e one particular version

of a backup file non-recoverable and a ll other backups created by other delta files of the same file would still be

intact.