I used Microsoft Word for many years and several times a year I would get a corrupted file for no apparent reason. Microsoft are unconstrained by finance, i.e. they can effectively spend as much money as they want to on their software development and yet it will occasionally corrupt files. Like all software Moodle has bugs, and the environment it works within has bugs (the PHP language, the database and the operating system). In 12 years I have never lost a file in Moodle, but one day I expect I will.
Backup and restore
Import of question bank failed
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