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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)