File archiving: copies of archived data and CAS

How many copies of archived data should be made and does file archiving require content- or CAS-based storage?


How many copies of archived data should be made?

There is no single answer -- it depends on the importance of your data, its retention requirements, and your confidence in the media. Honestly, if your data is important enough to archive for future use, then it's probably worth making multiple copies. Also, look at using multiple mediums. If you do choose to make multiple copies, be sure to keep your copies in different places. For example, one copy may go to a virtual tape library (VTL) as a backup, and another copy may go from VTL to tape. The VTL copy may reside on site, but the tape copy may be moved to offsite storage. Similarly, you may choose to replicate critical files on site, but send backup data to a VTL in another region across a WAN. Spreading out the copies reduces your risk.

Go back to the beginning of the File Archiving FAQ Guide.


Does file archiving require content- or CAS-based storage?

It depends on why you're archiving your data. If you're archiving for compliance, it's critical to understand the specific regulations or policies you are obligated to uphold. Some compliance regulations indicate that you have to preserve and protect the data in an unchanging/unalterable state. That might require storage on a WORM device or a disk-based content-addressed storage (CAS) system with access controls that prevent file changes using authentication and preservation checksums. Some storage solutions tout this approach as the "preferred" archiving technique, but that's not necessary in every situation. For general-purpose file archiving without regard to compliance regulations, an ordinary disk or tape system would probably be adequate.

Go back to the beginning of the File Archiving FAQ Guide.

This was last published in June 2007



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