Exchange Online Archive (EOA)

Microsoft Exchange Online Archiving is a Microsoft 365 cloud-based, enterprise-class archiving solution for organizations that have deployed Microsoft Exchange Server 2019, Microsoft Exchange Server 2016, Microsoft Exchange Server 2013, Microsoft Exchange Server 2010 (SP2 and later), or subscribe to certain Exchange Online or Microsoft365 plans. Description source

BITS

BITS is used to upload PST data from a workstation to the uploads directory on the PST Flight Deck server.  In a default configuration, BITS will determine the total bandwidth available to a client and dynamically throttle the upload of a PST file by balancing client workload and bandwidth availability.