https://www.veeam.com/kb4481
KB4481: Veeam.Archiver.Service terminates due to 'System.OutOfMemoryException' after updating to...
Veeam Support Knowledge Base answer to: Veeam.Archiver.Service terminates due to 'System.OutOfMemoryException' after updating to Veeam Backup for Microsoft 365...
due toveeamarchiverservice