If you're working on a big return, close the return periodically to create a backup

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If I'm working on an hour plus return (as many of us are this time of year), I like to close it every 30 minutes (or less) to create a backup. That way, if something goes wrong or I do something stupid, I haven't lost hours of work and can go back to an earlier point. You can even flag the records so you know where you were at the time that backup was made.

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Ctrl-F4 Ctrl-O Don't even let off the Ctrl key.