KB2969: Veeam Backup for Office 365 Complete Permissions
https://www.veeam.com/kb296926.06.2019 · Veeam service account permissions. Veeam service account you are going to use should have a Global Administrator role. Azure AD Application Permissions. There are two options: Have Veeam Backup for Office 365 automatically create the Azure AD application and all the required application permissions will be granted automatically. or
KB3154: Required Roles and Permissions for Veeam Backup ...
https://www.veeam.com/kb315428.04.2020 · You want to create manual permissions for your Azure account (service account) for Veeam Backup for Microsoft Azure or for a repository account. The Azure or service account is responsible for: Synchronization of virtual machines and disks with the Veeam Backup for Microsoft Azure database. Synchronization of subscriptions and storage accounts.