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Vinchin Blog Advantages of data deduplication

Advantages of data deduplication

2020-08-18

Data deduplication technology is also known as the capacity optimization protection technology. Currently, data deduplication is mainly used for data backup, and some companies have announced plans to use it in primary storage, but that's not the mainstream. Data deduplication can provide larger backup capacity, achieve data retention for a longer time, and also achieve continuous verification of backup data, improve the level of data recovery service, and facilitate the realization of data disaster recovery.


Greater backup capacity

Backup data contains too much redundancy, especially in a full backup of data. Although incremental backups only back up files that have changed, incremental backups often contain redundant blocks of data as well.

The principle of the data deduplication is to keep only a single copy of the backup data segment. When data is written to the backup device, the data is divided into variable-length data segments. The data deduplication device compares the data segment in real-time with each segment already stored. This ensures that only one copy of each unique data segment is retained. Because a data deduplication device can find duplicate files and data segments within or between files, or even within a data block, the actual amount of storage required is an order of magnitude less than the amount of data to be stored.


The data is continuously validated

In a primary storage system, there is always a risk associated with logical consistency checking. If a software defect causes the wrong data to be written, block Pointers, bitmaps can be corrupted. If the file system is holding backup data, errors are difficult to detect until recovery, and there may not be enough time to correct errors by the time recovery is needed. Backing up data is the most valuable part of the backup effort. Backup data is not often accessed, and when it is needed, it often means that there has been a human or system failure that requires data recovery. To check the consistency of the file system during the recovery operation, you need to wait until the next system restart or take the system offline, which increases the risk unnecessarily. Therefore, a good deduplication device should have an end-to-end validation process.


Higher data recovery service level

Backup data recovery service level is the index of data backup to backup equipment, can accurately, fast, reliable data recovery.

Full backup and restore perform faster because incremental backups often scan the entire database to find changed blocks of data, and incremental backups require one full backup and multiple incremental backups to restore, which also affects recovery speed.

Why, then, do many businesses adopt incremental backups? This is because full backup requires more backup time and backup space than an incremental backup.

For incremental backups, block traversal involves scanning the database to find changed blocks of data, which can take a long time. Due to further improvements in the performance of backup devices, the time required for full and incremental database backups is no longer the same.

Full backups and incremental backups at the data block level take up roughly the same amount of storage space on a daily basis. Compared with normal backup devices, backup devices using deduplication can save 95% of disk consumption when doing a full backup.

When backing up critical data, backup devices using deduplication technology can replace incremental backup with full backup to improve data recovery service.


Facilitate the realization of backup data disaster recovery

Data replication as the mainstream of disaster recovery are very concerned about the real-time replication of data, but backup data disaster recovery no attention. Because data deduplication has a good capacity optimization capability for backup data, doing a full backup every day requires only a small number of disk increments, and it is the data after capacity optimization that is transmitted remotely over WAN or LAN, so network bandwidth can be greatly saved.

Today, many businesses see online replication of backup data as an alternative to remote tape storage. In the replication solution, data is copied from the local primary disk to remote disk storage over a LAN or WAN. To enhance protection, companies can also increase the frequency of data synchronization, or configure remote sites to be full disaster recovery sites where business operations can be started in the event that the primary site needs to be down for a period of time.


When selecting a product with the function of deduplication, customers should investigate from the aspects of the capacity optimization algorithm, continuous data validation, data service level, convenient and efficient disaster recovery, etc. Such that,  Vinchin Backup & Recovery with the data deduplication is one of your trustworthy choices for backup solutions. Not only Vinchin also with compression technology helps compress data from backup repository to reduce storage space and costs.


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  • Backup

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