On the Veeam website, there is an online capacity calculator website for Veeam Backup for Office 365. Veeam Backup for Microsoft Office 365 Capacity Calculator Use the Measure-VBOOrganizationFullBackupSize PowerShell cmdlet.Use the latest Veeam Backup for Office 365 Calculator Excel sheet.Veeam Backup for Microsoft Office 365 Capacity Calculator.There are, actually, three good ways to make a guesstimate on the required disk space to store the repository, whether it's on disk or in object storage:
As organizations embrace the full suite of Office 365 and intend to use Veeam Backup for Microsoft Office 365, I often get the question on how to properly size the storage for the repository for Office 365 backups.