Your Scratch Pad data is safe and accessible.

It can be Migrated to a new Workspace, once you create an account, using the 'Cog Icon > Settings > Data > Migrate data' menu option.

Alternatively, it can be Exported from the Lightweight API Client(signed out version) using the 'Cog Icon > Settings > Data > Export data' menu options.

You don't need to go searching for the data in your file systems.