The best plan to backup your data is to have your data structured and stored in such as way so as you should never have to use your backups. Our attitude to backing up your data is that backups is and important insurance policy for your data that you only need to access if the worst was to happen.
Some questions to think about:
- How long could your business operate without any of your emails files or systems?
- Would would survive if you were to loose your data completely?
- When was the last time that you tested the backups that you are doing?
- Do they contain all the data you think that they do?