Savefiles in local save directory

Hmm. Doing a search with forum search for *.cst lead to this conversation over in the GD Stash thread:

Someone posted this thread as well back some months ago (no replies):

Edit: Zantai responded with this about it in Discord:

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…by which I’m assuming he means that upon installation and loading in FG the first times these “backups” were created because as far as I know “normally” they have long been of the .gst/gsh variety.