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We have some VMWare ESXi virtual machines, some of the virtual machine is big, like 700GB, we wish Vembu backup task will be complete fastly and not consume backup disk much.

I want to know is the backup incremental or differential? I am considering how I delete files to release space when backup disk is nearly full.

How it save the different part? For example if a virtual machine vmdk file increased from 100MB to 150MB, does Vembu backup task backup this whole vmdk file or create a another file to save extra 50MB data.

Last question how long will Vembu server to compare, calculate the different between source and last or full backup?

Thank you.