Go to your user data folder and then go to AppData > Roaming > Mozilla > Firefox > Profiles > (a bunch of junk that ends in .default) > gm_scripts and you should have subfolders there for all your userscripts, including Steamgifts++. I don't know which of the files there contains the data for tags (maybe one I don't even have, since I haven't made use of the feature yet), but altogether they're less than 200 kB for me anyway, so it shouldn't be a big deal to back them all up, if necessary.
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It's an SQLite database file. You could open it with e.g. DB Browser for SQLite, and export the data to an SQL file (which is just a text file). From that find the lines you want to keep, and delete the rest. You can later "import" the selected data to a (new) database file by pasting the lines to the Execute SQL tab, and well, executing them.
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What folder contains the data for Greasemonkey scripts in Firefox? SG++ tags disappear after running CCleaner, as I would expect, but I have no idea what to backup to get them back.
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