I would really hope we can find a more permanent solution for this content of archival value; perhaps via Archive.org using the "Archive-It" functionality ? I could even imagine using this service in order to preserve other MO content for posterity. Some relevant points from the FAQ:
What is Archive-It?
Archive-It is a subscription service that allows institutions to build and preserve collections of born digital content. Through the user-friendly web application, Archive-It partners can harvest, catalog, manage, and browse their archived collections. Collections are hosted at the Internet Archive data center and are accessible to the public with full-text search.
What are your fees?
At this time we have no fees for uploading and preserving materials. We estimate that permanent storage costs us approximately $2.00US per gigabyte. While there are no fees we always appreciate donations to offset these costs.
Who has access to the collections?
Anyone can access our collections through our website archive.org. The web archive can be searched using the Wayback Machine.
The Archive makes the collections available at no cost to researchers, historians, and scholars. At present, it takes someone with a certain level of technical knowledge to access collections in a way other than our website, but there is no requirement that a user be affiliated with any particular organization.