After installing Veeam Backup & Replication 9.5 Update 3a, the backup duration may be significantly increased for jobs using the Virtual Appliance (HodAdd) transport mode. Other transport modes (NBD/NBDSSL, Direct SAN, Direct NFS) are not affected.
This is a known issue affecting VMware VDDK (Virtual Disk Development Kit) versions 6.5.2, 6.5.3 and 6.7. Please refer to VMware KB55418 article for more information.
A hotfix for Veeam Backup & Replication 9.5 Update 3a (build 220.127.116.112) is available to switch to using unaffected VDDK versions. To install the hotfix:
Stop all Veeam jobs and Veeam services
Copy these files and folders to an alternate location from the backup server and all backup proxies to have a backup: