Backup is like a strategy to keep your valuable data in the safe zone. Like other data assets, email depository is a backbone for any individual or corporate. If we talk about MS Outlook, it holds centralize data file i.e. PST. In a PST file, users can access all components like emails, contacts, calendars, journals etc. But, it should be intact to avoid any kind of access barrier.
Being a responsible user, you should make sure that availability of recently updated data which includes all items (Emails, Contacts, Calendars etc.).In some cases, Backup in Outlook helps an organization to recover from disaster like pain. For Example: If your personal storage table (PST) file gets error or bug. Then, probability of corruption in MS Outlook is high. In this case, backup is a single assistance to re-gain the lost emails again. So, it is a useful practice for 100% data safety assurance at user’s end.