I have a #backup question: How do you manage file-based app backups?

For example, my TOTP app makes a backup now and then. Each backup is a JSON file with the current date in the name. The folder gets sync'ed to my PC via #Syncthing and backed up from there via #restic. But, does it make sense to keep all files in the folder? Restic already takes care of file history, so maybe I should keep one file and override it? Or make a script that deletes old copies?