Microfilming can offer as much as a 98 percent reduction in storage space over storing records in their original paper format.  And by having a back-up copy of microfilm stored off site, a government can almost immediately recover from any disaster or occurrence that damages its vital records. Produced correctly, microfilm is considered to be archival quality, meaning it is a suitable format for storing permanent retention documents.
But microfilm has disadvantages. No alternative format is going to be a perfect solution for all your records management problems. Microfilming is not cheap. It is a labor-intensive process that requires expertise of the person doing the work. Additionally, if microfilm is not properly produced, developed and stored, it will not stand the test of time.
 In this text, the terms “microfilm” and “microfilming” are used generally to discuss the various micro-photographic processes available.
 Using Microfilming, p.1.