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Disk Based Backup Systems
Many of the backup and recovery headaches associated with tape-based backup can be mitigated with the use of a disk backup device in the data path. Manufacturers have responded with Virtual Tape Drives (VTD) and Virtual Tape Libraries (VTL) arrays. Incorporating inexpensive ATA disks to emulate tape drives and/or robotic libraries is quickly becoming the mainstream backup methodology of choice.
Sourcetek represents the leading suppliers in this market with a wide range of capacities to help solve today's real-world challenges including: exploding data growth, shrinking backup windows, evolving IT infrastructures, and the need to preserve technology investments.

Most Common Data Backup and Recovery Problems

Can't meet backup window
Slow data rate
Unreliable backups
Human errors
Difficult to manage
Not automated
Complex tape rotation scheme
Too expensive
Not meeting compliance requirements

How Deduplication Reduces Data
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Provide a fine-resolution means to map a large disk repository into as small an "index footprint" - or "data dictionary" as possible (this is a technologically challenging but important dimension of data deduplication)

Analyze new incoming data (that is sent to the disk repository) against the index, to determine whether elements of the new data already exist in the repository

Store only data that does not already exist in the repository by referencing the already-existing identical elements of the data that are in the repository

Update the index with all new elements of data that are stored in the repository so the new elements can be the source of referencing for subsequent data streams.

Data Dedup for Dummies: Quantum