@florent you guys are absolute geniuses, there isn't a company in the world that matches your quality support.
I have a question though, say I have my backup set with 2 retentions on delta, and we do a full backup say each 20 backups. Am I right to assume that when the full backup occurs (so after 20 backups), in theory, there will be 2 full sets on the backup storage?
Example
Day 19:
Full.vhd
delta.vhd
On day 20:
oldfull.vhd (which is a merge of the day 19 full + delta)
newfull.vhd (which is the new VM)
Day 21:
full.vhd (which is now the old newfull.vhd)
delta.vhd (delta for day 21)
If so, that means that if we have large VM's (some are 2.5TB in size), there will come a time that that VM will use up double it's size on the backup storage.
Lastly, as we will be moving to XCP Pro + support in January, we want to move our backups from the now historical / community edition to the new one. I know at some point I saw you had moved to NBD backups and there is also an option to "test" the backups. Would this then make periodical full backups irrelevant as there would be no need to worry about backup corruption over time?