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Backup-to-disk refers to technology that allows one to back up large amounts of data to a disk storage unit. The backup-to-disk technology is often supplemented by tape drives for data archival or replication to another facility for disaster recovery. Additionally, backup-to-disk has several advantages over traditional tape backup for both technical and business reasons explained later in this article. With continued improvements in storage devices to provide faster access and higher storage capacity, a prime consideration for backup and restore operations, backup-to-disk will become more prominent in organizations. == Technical Advantanges == There are technical advantages to backup-to-disk technology. One of the main advantages is the speed at which backups can be performed to the disk appliance. Backing up data to a backup-to-disk technology can be up to four times faster than traditional SCSI tape devices. While the new Serial Attached SCSI (SAS) connected tape drives are faster than the original tape drives, the disk appliance is still faster than most tape technologies. These faster backup times lead to shorter backup windows allowing the technology to backup the data while in a smaller amount of time thus increasing the window for processing which is also a benefit for the business.〔(【引用サイトリンク】title=Disk versus Tape )〕 Another advantage that backup-to-disk offers is data de-duplication and compression. The disk appliances offer either de-duplication at the source or at the destination. The de-duplication at the destination is faster and requires less performance overhead on the source host. The de-duplication requires less disk space on the disk appliance as it stores only one copy of the possible multiple copies of one file on the network. Many of the backup-to-disk technologies advertise up to 15 to 1 compression ratios. This also allows the information technology department to store more data on less disk space. With de-duplication a disk appliance with 5 terabytes of raw disk space can store as much as 30 terabytes of compressed and de-duplicated data. One of the biggest advantages to disk backup is reliability. There have been studies that show that 70% of tape restores fail. The disk appliance will eliminate tape errors which will improve the success of both backup and restore jobs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Backup-to-disk」の詳細全文を読む スポンサード リンク
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