If your data is locked by a ransomware attack, a back up is vital to help you rapidly recover.
Regulation means some files need to be retained for years; a backup is a reliable, cost-effective way to achieve this.
A motivated insider can cause havoc by deleting files and chats, a backup means data is not permanently lost.
Build in tools make it easy to find specific information to satisfy legal requests from court actions.
Accidents happen and a reliable backup makes it straightforward to recover files and chats that have been accidentally deleted.