SQLite

  sqlite:
    # If true, a copy of the database file will
    # be created daily
    use-backup-file: true
    # How many backup files to keep
    # before starting to delete the oldest one
    number-of-backups: 4

The data generated is stored inside a file named sqlite_royalebanks.sql inside the folder data/sqlite. The above options allow you to create daily backups of your database.

If enabled, a backup is created each day at midnight.

The server's midnight might not necessarly be your midnight. Depends on the system's timezone.