"Menu:file/backup to...". This enables you to make copies/backups of the current data file. It is wise to perform a backup regularily if you often change your address data. Warning: if you change your password and have older back-ups of encrypted files, these older files will only be accessible using the password which was valid at the time of making that back-up. This is because the password-verification information is stored in the data files (not the password itself though).