In Oregon, paper and microfilm are the only accepted methods of permanent retention. Oregon Administrative Rules, Chapter 166 deals with this.
(1) Public records with a scheduled retention period of less than 100 years may be stored on optical disks. The original record may be disposed of following verification of acceptable optical image quality. Images stored on optical disks shall be copied onto new optical disks after no more than ten years. Images must be recopied until the retention period of the original public records has been satisfied.
(2) Public records with a scheduled retention period of 100 years or more may be stored on optical disk devices provided that the original records are retained in hard copy or on microfilm for the entire scheduled retention period.
Hope this helps.
Jim Mullen, Records Manager
Oregon University System
P.O. Box 488
Corvallis, OR 97331-0488
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