![]() ![]() ![]() for SharePoint at Reports > Usage > SharePoint > Site Usage > Storage. You can view current and previous data usage for SharePoint Online and OneDrive for Business in the Microsoft 365 Admin Center, e.g. ![]() While processing the backups transaction protocols and database checkpoints can take up to 10% of the repository space which is calculated as the workspace. More optimistically this factor can be also calculated with 1.5. For normal mailbox backups the change rate is multiplied by 2 because of archiving and file versioning which takes up additional backup space. ![]() In the field we experience typical daily change rates from 0.2 to 1%. The following example returns the size of all primary mailboxes and can be adapted for archive mailboxes using the -Archive option: Get-Mailbox | Get-MailboxStatistics | Select-Object DisplayName, ItemCount, TotalItemSize | Format-Table –autosize You can get the Total size of current primary mailboxes with Get-Mailbox and Total size of current archive mailboxes with Get-Mailbox -Archive. If you run an existing M365 or on-premise Exchange use the PowerShell commandlets Get-Mailbox and Get-MailboxStatistics on your infrastructure to get input to the following formulas. (Current archive mailboxes total size) + ((Daily change rate) * (Days of retention)) + (10% working area) ![]()
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