Protecting Exchange Online mailboxes

What items can be backed up?

You can back up user mailboxes and shared mailboxes. Group mailboxes and archive mailboxes (In-Place Archive) cannot be backed up.

The following items can be recovered from a mailbox backup:

You can use search to locate the items.

When a mailbox is recovered to an existing mailbox, the existing items with matching IDs are overwritten.

Recovery of mailbox items does not overwrite anything. Instead, the full path to a mailbox item is recreated in the target folder.

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