I wanted to share my first experiences so far, for 1 single disk vm it works perfect, cbt is created and left only for metadata till the next backup.
For vms with 2 disks i run into some strange behavior, after the bacup job is see one of the 2 disks snapshot (random) at the health page as not connected to a vm and when i run the backup job again it gives an error "source and target are unrelated", the orphan vdi section.
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not shure if this is an issue on XCP side or on a bug inside there software.
as i cannot seem to reproduce this issue on single disk vm's i feel like this is an issue with multiple disks. i am contacting there support to see if this is a bug on there end or if this is an issue inside XCP itself.
Keep u all posted on the progess of this tests.