Add veeam backup delta per vm and per job

[rschitz]

[rschitz]

https://helpcenter.veeam.com/docs/backup/vbr_rest/reference/vbr-rest-v1-2-rev0.html?ver=120#tag/Sessions/operation/GetTaskSession

readSize: Amount of data read from the datastore by the source-side Data Mover prior to applying compression and deduplication.

transferredSize: Amount of data transferred from the source-side Veeam Data Mover to the target-side Veeam Data Mover after applying compression and deduplication.

[rschitz]

[rschitz]