Backup before upgrading from V10 to Professional? 
Author: Steve Samoska
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Do I have to back up all my sites before installing professional? THEN LOAD THEM ALL?
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Steve, Its always good to backup. But no it's not necessary. If you set the preferences directory in pro the same as evolution you will have all your evolutions projects in v10 pro.
I would advise to export and import, this way you will keep the correct versions to the correct programs and you have both to work with. (you never know what happens and you can fall back to Evolution.)
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