Backup Lotus Notes Mail 6.x

[GBSB]

We are in the process of moving out mail servers Lotus Notes 6.x to 8.x.
The existing enviroment is running on Windows 2003 server.
Until we start the project we want to virtulise the existing servers (not a problem).
Our question is as follows:
One thing that will happen is that all mail boxes will change more times daily so when we do incremental backups does this just do a block change or does it backup the complete .nsf file.

Any guidance / experience from anybody that already does their backup with Veeam for Lotus Notes mail would be appreciated.

[foggy]

Veeam B&R works on the VM block level and transfers only changed blocks during incremental runs.