The backup infrastructure is a primary target for attack because all relevant environment data is stored in that one single place. Second, if an attacker wants to destroy data, the backup environment is a good starting point because the backup server has access to pretty much every other important system, such as virtualization platform or storage systems.
Veeam's Backup Copy Job can provide more than its name suggests. The primary task of Backup Copy Job is to copy existing backup data to another disk system in order to restore it later or even to send backup data to an offsite location (see the 3-2-1 Rule).
Additionally, Backup Copy Job performs an integrity check of the backup data. Veeam saves a checksum for every data block in the backup file. Backup Copy Job verifies if the checksum fits and therefore, it can detect if the data has been changed (for example, to ensure there was no so-called “silent data corruption”, i.e. any overlooked errors).