Limitations of Microsoft 365

When you select the Overwrite option, from the Recoverable\Deleted folder only missing items can be restored. Existing items in the Recoverable\Deleted folder cannot be overwritten.

After restores, folder permissions for some folders (especially calendar folders), are not reflected on the Exchange Online server intermittently.

When you select the Overwrite option, for an item available in a Public Folder, a duplicate is created instead of replacing an existing item.

When you select the Retrieve items when Message Read property changes check box, the item-level changes may not be updated in the immediate incremental backup. The changes are updated in subsequent backups.

Folder size may not be updated if you make changes to the contents of the OneDrive folder, and then take backup immediately.

OneDrive recycle bin contents are not protected.

Permissions that are related to links giving access to OneDrive items are not protected.

Properties of a OneDrive item that is created by a non-OneDrive user are not protected.

OneNote redirect restore to a document library of the same user or group is not supported.

In-place restore of OneNote to a non-default document library of a user or group is not supported. In this scenario, you can restore to file system.

Document library other than the default, which does not have English names, always displays English names. For example, doc1, doc2, and so on.

If files and folders are shared with others users, then after restore on the shared tab in the other users' account, it shows that files or folders are shared by SharePoint App instead of the name of the user who shared the files.

Groups that are created from admin center are not displayed in OneDrive and hence in Backup Exec also groups are not displayed.

OneNote Notebook section sequence is not maintained during restore.

OneNote Notebook in Azure China region is not protected.

Direct Access permissions may not be backed up or restored correctly. This is a rare scenario when Graph API does not return correct permissions during backup.

Sender of the item invite is displayed as SharePoint App user after restoring Direct Access permissions.

For OneDrive incremental backups, only if the permissions of a folder change, it is not backed up.

OneDrive restore operation may fail if you have some special characters in the User Principal Name (UPN). You can restore user OneDrive to a local file system, to access the contents.

OneDrive documents that are protected by a compliance policy and contain sensitive information are skipped during backup without displaying an error. For example, GDPR policy protects personal information, financial information, such as credit card data and account information is protected by a finance policy.

Backup Exec does not back up or restore mailbox-level properties for Exchange Online.

In Backup Exec, a previously deleted item that was created during restore to Exchange Online is counted as a new mailbox item. If you run the same restore job again, a duplicate of the item is created.

Backup Exec does not back up the Journal mailbox for Exchange Online.