Dell PowerVault DL2200 CommVault - Manual (Page 6)

6
BACKUP-TO-DISK AND RECOVERY WITH DEDUPLICATION
wHat IS DeDuPlICatIoN?
Easy-to-Quantify Capital Cost Savings Backups are notorious for containing a tremendous
amount of duplicate data. The same data continues to get backed up day after day,
unnecessarily consuming large amounts of storage space. For example, consider a Word
document sitting in a file share folder that is part of a completed project. Chances are that
it will not be altered ever again. Yet, day after day and week after week, this same file could
be duplicated and stored many times within a backup-to-disk environment. Deduplication
technology can be used to store the Word document only once within this disk-based backup
pool.
Data deduplication is the process of examining data to identify any redundancy. The same data
keeps getting backed up over and over again, consuming more storage space and impacting
cost, thereby creating a chain of inefficiency. The DL2100 can supply up to a 15X reduction in
capacity needed for backup. This means that companies can potentially store up to 15 TB of
backup data on 1 TB of physical disk capacity, which has potentially tremendous economic
benefits. The actual amount of data reduction an organization can expect to see can vary
significantly depending on the type of data being backed up, retention periods, the frequency
of full backups and the data deduplication technology.
Daily Full
Weekly Full
File Dedup
days
5 days
10 days
15 days
20 days
25 days
30 days
1500GB
2000GB
2500GB
3000GB
Daily Full
Weekly
Full
File Dedup
Rather than duplicate a copy of the same
file, a pointer is used to a previously
stored version, reducing the physical
capacity needed for a backup job.
As a result, a backup-to-disk pool will
store a much larger number of daily
recovery points for rapid recovery
(reducing the need to resort to tape).