Veeam Fix
Veeam have recommended disabling and re-enabling CBT - which can be done with this powershell script - http://www.itwalkthru.com/2012/03/disabling-or-enabling-vmware-change.html
The next backup will take quite a bit longer though!
Redditor “tottenham12712” has pieced together a scary scenario for VMware users: ESXi might be feeding dud data to backup software. VMware knows it has a problem. Indeed, it has explained in this knowledge base article that when vAdmins expand a vmdk file past 128GB, and Change Block Tracking (CBT) is enabled, the …