If someone isn't going to take the time to read a User's Guide, even when they encounter a problem (when it's easy to search on, say, FileVault), I'm not sure a warning will help much...
Anyway, note that you can back up your FileVault information *separately* by selecting its volume in the source pop-up and using "Backup - all files". Direct that copy to its own volume...
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--Dave Nanian
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