We often get asked by users Office 365 and Google suite users, if they need to a separate backup. The short answer is yes. That’s because Microsoft does not back up your data. While there is retention built-in, Microsoft is not liable for your data (see their service agreement – section 6b). Microsoft even recommends using a 3rd party to backup your data.
The 3-2-1 Backup Rule
The 3-2-1 backup rule is an easy-to-remember acronym for a common approach to keeping your data safe and protected in almost any failure scenario.
The rule is simple: keep at least three (3) copies of your data, and store two (2) backup copies on different storage media, with one (1) of them located offsite (using a 3rd party backup).