If you configure a backup copy job within Veeam and get this error it quite likely happens because you have chosen “LAN Target” for storage optimization on your basic backup job. Jobs with this settings have another block size and will not process with copy jobs – even not with Veeam Cloud Connect.
Error you will see:
The only solution that worked for me was to perform a new active backup (on the source job) or delete all the backup files and start over (in case you do not have enough space for additional full backups).
Change “Storage optimization” to local target and start your full backup. After all your copy job will work like it should.