Please note that the backup file containing the project that you want to import must be from exactly the same version (5.2.11) of JIRA as this one.
The system I want to import a couple projects from is running 5.0.6 -- do the version numbers truly have to be exactly the same?
It has to be the same version. That's the only supportable route.
In reality, you can actually just hack the stored version number in the xml and it can work. However, I've only ever seen that work for point revisions (because the shape of the data almost never changes in point revisions). So, 5.0.6 to 5.0.1 or 5.0.9 stands a good chance of working, but 5.0.x to 5.2.x really won't.
The route from 5.0.6 to 5.2.x isn't too painful though - export the whole lot, import it into a temporary empty 5.2.11 (or copy the database) and Jira will upgrade it. Then you can export it and import it.
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