Is it really worth the extra cost for archival gold discs?  That depends on your goals.  You have tons of choices for data backup, from paper to tape to optical media.

Here is a chart and information provided by MAM-A, the leader of archival gold media:

Archive Media:  How long is long enough?

Eventual migration to another media is inevitable

Migration is expensive

Keep your data on one media as long as possible.

Start with media with the longest expected lifetime.

Technical Information at:

 http://www.mam-a.com/technical_papers

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