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A few years ago I went to a two-day photographic seminar at the Centre for Contemporary Photography in Melboune, hosted by Dr. Les Walkling. One of the things I learned was that about three or four current "file formats" become obsolete around the world almost every month. Not just for images, but for files in general as well.
Their advice was to back up in at least three places - your PC, and two separate HDD's, and to back up in different file formats as well, basically creating copies of the same files in different formats. That was based on advice from the National Archives at the time. I can only imagine things have continued to evolve.
Do I think the way we store things will change? Very much - but don't ask me how!
Will it all be useable in 20 to 30 years? In all honesty, I don't know.
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