![]() ![]() Dedupe can drastically reduce the amount of physical storage needed to hold backup data. Dedupe and compression effectively “squeeze out” excess space in files by identifying and eliminating redundant data and then creating unique hashtags to maintain the integrity of the deduplicated data. When a recovery is required, the images are used to reconstruct the data as it appeared when the most recent snapshot was taken.Ī major benefit of backing up to a disk target is the ability to reduce the size of the data backup by using deduplication or compression. Those images reside on the same storage system as the original data, so they must then be replicated to another system on- or offsite. ![]() Snapshots periodically grab an image of the changes that have been made to the stored data. Then, at relatively short intervals, the CDP apps will copy those changes to a master backup where the updates occur.ĭata can similarly be backed up on an ongoing basis at the storage system itself using snapshot technologies. Some CDP products use agents installed in servers or clients to keep track of the changes to the data. Rather than wait for a time when data isn’t being accessed, CDP products effectively lurk in the background and back up data as it is created or modified. Using a cloud storage service, one copy of the backup remains on-premises for single file recoveries while another data set at the cloud service is available for more extensive recovery operations.Ī variety of products collectively categorized as continuous data protection (CDP) applications can also address the issue of shrinking backup windows. That problem can be resolved rather simply by engaging a cloud storage service as a backup target. Hard disks typically aren’t easily transported. However, D2D created a new problem: moving backups offsite for safekeeping. The main appeal of disk-to-disk - or D2D -backup is that it’s far easier to recover data from a hard disk drive than from tape. As the price of hard disk technology dropped and hard drives grew more capacious, organizations shifted from tape to disk-to-disk backup. Today’s largest tape libraries can contain dozens of tape drives and thousands -even tens of thousands - of slots to hold tapes, thus offering ready access to petabytes of data.ĭespite the potentially huge capacities of tape systems, the use of tape for backup has diminished considerably in the past 20 or so years. Tape offered a relatively inexpensive way to store data, media that is easy to remove and transport, and the easiest way to ship copied data to other locations for safekeeping. In the past, tape was the predominant backup target media. Today, many companies conduct business on an around-the-clock basis with no definable backup window available, so alternative backup methods must be employed.īackup applications copy data to separate storage systems which may use a variety of media, including tape, hard disk drives, solid-state drives or cloud storage services. As organizations began to create and collect growing volumes of data, a backup operation would sometimes spill over its “window” and into the next workday. Traditionally, backup activities occurred overnight during non-business hours when there was less likelihood that users or applications would access data. In some cases, the backup software can temporarily halt a process that is accessing data so that the data can be copied. Most backup apps require that data is not actively accessed or manipulated during the backup process. A backup application will make copies of data at preset intervals and send those copies to a separate target storage device. ![]()
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