Veeam Backup for Microsoft 365 uses the Veeam Azure archiver appliance, a small virtual machine deployed in Azure, to efficiently move backed-up M365 data (Exchange, SharePoint, Teams, OneDrive) into Azure Archive Storage (cold tier) for long-term, low-cost retention, minimizing data egress and speeding up copy jobs by processing data locally within Azure.
The upgrade failed because the SSH public key fingerprint of the Linux proxy does not match Veeam’s expectations. This typically happens when the proxy’s SSH keys are changed, the server is rebuilt, or the fingerprint stored in Veeam is outdated.
