https://www.idrive.com/endpoint-backup/online-backup-exchange-server/exchange_brick
Brick-Level Backup for MS Exchange Mailboxes with IDrive® 360
Use IDrive 360 brick-level backup to securely back up individual mailboxes from your MS Exchange Server
ms exchangebricklevelbackupmailboxes
https://docs.j7k6.net/exchange-export-all-mailbox-pst/
Export all Exchange Mailboxes as .pst
export allexchange mailboxespst