Version 0.22 of the Tag Groups plugin comes with a new feature that was requested already several times: You can now export your settings, including the groups you created.
Tags won’t be included, neither their assignment to the groups. The reason is simply that their assignment to the groups is saved with the tags – together with their names etc. Extracting and exporting their group assignment would make things more difficult (but I will keep thinking about this option).
If you use export and import in order to clone the groups to another WordPress installation, you might afterwards have to go through the tags and assign them to the correct groups. You can use the bulk editing feature – check all applying tags and then choose “assign to” from the pull-down menu, together with the new group.
Another novelty of this version is that uninstalling (or deleting) the plugin won’t automatically wipe out all settings and groups. There are some rare cases when users want to remove the files, or they delete the plugin by mistake.
Last but not least, a huge Thank You to those users who supported me with a donation (and usually a friendly message)! It is highly appreciated!