Status is Synthetic full 79% done ?

[antivir]

Inside job's statistic: all VMs are Success, but status of job is Synthetic full 79% done. What does it mean?
Processed 965 GB, there are 324GB on NFS-storage (growing, and minimum network activity between VBR and NFS storage) - what does it mean too?

There is VeeamAgent on NFS storage, he is doing something after all VM is success...

[foggy]

This means that this job is performing synthetic full according to its schedule (backup is being built synthetically from the previous full and subsequent incrementals). This activity takes place locally on the backup target repository right after the regular incremental job run (that's why the backup status of all VMs is Success).