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Human thought crawls at 10 bits per second, Caltech study finds
(www.techspot.com)
This is a most excellent place for technology news and articles.
In some contexts, a bit can refer to a boolean variable, a flag. In other contexts, it may refer to the voltage at a certain point, or any number of other things. But when you are talking about bits/s then it's a measure of information.
Yes, but as you know, this implies that the information is already available. You can use that knowledge to create a compression algorithm, or to define a less redundant file format. That's very practical.
We can also be a bit philosophical and ask: How much information does a backup contain? The answer could be: By definition, 0 bits. That's not a useful answer, which implies a problem with the application of the definition.
A more interesting question might be: How much information does a file contain, that stores the first 1 million digits of the number π?