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How to backup file tags and comments?

Dear all!

I see that now in Plasma 5.10.2 at least for me the first time both file tags 
and comments (that I can enter via Dolphin) seem to be stable and not suddenly 
disappear. So I would like to use them much more, BUT...

... I would also like to know how I can backup the database(es) that this is 
based upon so that in case of setting up a new / different KDE distro I can 
"simply" restore all the meta file information.

Thank you very much in advance for helping!

I. Thomas