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That is very unusual. Savegames usually stored in the user directory, like
/Users/Username/Library/Application Support/Tahira/...

But for Tahira the Savegames are stored inside the App:
/Applications/Tahira Echoes of the Astral

If you reinstall the App or update the App, all savegames are lost in that case. Other problem: all users of the installed App share the same savegames. User A can delete or load savegames of User B.
Post edited August 13, 2017 by Lebostein