You can use the Commvault software to back up and restore Microsoft Exchange Online.
Data You Can Back Up
Public folder mailboxes
Backups You Can Perform
Forever incremental backups
When You Can Perform Backups
On a schedule: The server plan that you assign manages scheduled backups
On demand: You can perform on-demand backups at any time
Backups You Can Use for Restores
The most recent backup: For example, restore the most recent backup to secondary storage, such as tape, for long-term storage
A backup from a specific date: For example, restore data to a point in time before it became unusable
Backups from a date range: For example, restore data that was accidentally deleted
Destinations You Can Restore To
The current location (in place)
A different folder on the same mailbox, or a different Exchange mailbox (out of place)
A CAB, EML, or PST file
You can use either basic or modern authentication to access user data for backups and restores.
Data is retained according to the Office 365 plan that you assign to a mailbox when you add it to the Exchange Online app in Commvault. The default value for data retention is indefinite. You can modify that value to limit the amount of time that data is retained.
The index server is scanned every 24 hours. Messages that are eligible for data aging based on their received time and the rules defined in the plans are pruned.