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In fact, no medium you choose is going to be easily readable with simple or no technology, AND impervious to wear and tear. One way around that is to back-up data in 2 formats, one designed to survive the ravages that would damage or destroy the other... say ceramic, which will not burn, and stainless steel, which will not break. The other solution is simply combining the strengths of one medium for data with the strength of another medium as a package.
As the issue of technological readability is an issue, perhaps something we should be considering is the careful preservation of certain machines as well, to use as the tools to rebuild after a catastrophe. Cache-ing certain pieces of large and small equipment, perhaps in well-marked underground bunkers, with full instructions included on how to assemble and use, could be the things future people might use after a disaster to start to recover their infrastructure.
An interesting study could be done on exactly what would be best to cache... something repairable, and which can be used to build other things, which can build other things, etc. Maybe the idea would be to cache a flexible factory, complete with its own tool fabrication equipment.
Hmm... I feel story notes coming on...
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