Just added a new tag “data-recovery” to this Forum and tagged several earlier threads.
Here’s are some of the resources you might want for identifying the version of your Gramps data. (Which is just a bit more info than in my reply to your Gramps for Genealogists group on Facebook posting).
- The Gramps XML versions wiki article lists versions of the database schema and of XML.
- The Previous Release Notes of Gramps wiki article lists of release versions and dates with links to the user guide.
- The repository of stable Gramps previous releases is on SourceForge