With an Altaro Office 365 Subscription, each user license backed up will be assigned 50GB of pooled storage space.


This means that if you are backing up 50 Licensed Users from your O365 Organisation, you will be assigned (50GB * 50 Users) = 2,500GB (2.5TB) worth of storage space collectively, which is averaged across all users for the Organisation.


For instance, let's say 1 user is taking up 100GB of space across his Mailbox, OneDrive and SharePoint, while the other 49 are using up about 5GB each. This means that only 345GB is being used collectively, which equates to 2,155GB (2.1TB) of free storage space leftover.



How to check the O365 Storage


The space is calculated on the Source data backed up, so this can very easily be checked from your Microsoft O365 Admin center account.


  1. Login to your Microsoft 365 admin center

  2. Go to [Reports] > [Usage]

  3. Choose [Exchange] > [Mailbox Usage] > [Storage]. This shows you the current amount of space utilised by your O365's Mailboxes.


  4. If you are also backing up OneDrive and SharePoint, make sure to check the storage used by these services too as follows:

    [OneDrive] > [Usage] > [Storage]
    [SharePoint] > [Site Usage] > [Storage]

    Finally, add up the space utilised by these with that of the Mailboxes for your global O365 protected data.