>>>> A thought just occurred to me, all my prefs are in my Dropbox folder.? <<<<< >>>> Everything except for the base install.? <<<< >>>> I did that to keep from losing my loco's & pref's through each iteration of JMRI. <<<<
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Not what Dropbox was really designed for.
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I’ve upgraded JMRI hundreds of times over the last 12 – 15 years and have never lost my dataset.? While taking your own backup before an upgrade is a good idea, the upgrade process is designed to protect your data in place.