Does what it says it will!

It is used to back up our entire Exchange 365 (2 TB), Sharepoint and OneDrive for the whole company to the on-prem NAS device. This is to address the fact that Microsoft does not retain backups of this data. Also, it is a way of retaining data for litigation protection.

The realization that we were vulnerable if Microsoft suddenly deleted or lost our data. Unlikely scenario to be true but we would be negligent not to consider the possibility. We're a project-based company, some of which go on for years. Email is our main record of business so it's important we maintain a long term backup store. We've moved into Sharepoint 365 and are using OneDrive as an alternative to Dropbox. It is therefore important to ensure these accounts are backed up regularly.

Everything is controlled through an IT admin. We deliberately do not give end-user access to the product. That's more to do with limitations with our users than it is with Veeam.

On several occasions, we have deleted a mailbox (deliberately) to create a new user account for someone and then used Veeam to populate the new account.
Depending on circumstance we have exported as pst or restored to the original location.