@florent I disabled CBT on the vms and re-ran a delta backup. I noticed the following. While watching the backup task when it shows [XO] Exporting it will not show the percentage and completion. Watching backup task a vm will show not using NBD at first but using XO and then fail. The backup log will then show vm fell back to full backup and the task will then show that it is using NBD. [image: 1776658910502-screenshot_20260420_002103.png] [image: 1776659182806-screenshot_20260420_002557-resized.png] [image: 1776659254182-screenshot_20260420_002717.png] [image: 1776659855936-screenshot_20260420_003717.png] Also with out CBT GC is not constantly spamming once a vm has finished exporting and started health check. It appears to actually be running and able to coalesce as they are no longer showing in the dashboard / health... delta job with CBT enabled - 2026-04-20T00_43_48.487Z - backup NG.txt CBT disabled delta job. two vms fell back to full - 2026-04-20T03_19_02.894Z - backup NG.txt Next delta job with CBT disabled 1 vm fell back to full - 2026-04-20T04_19_10.531Z - backup NG.txt [image: 1776658716005-screenshot_20260420_001804-resized.png] [image: 1776661420315-screenshot_20260420_010236-resized.png]

@olivierlambert +1 For creating vApps GUI in XO Reason: I recently had this configuration: VM1 - Delay 90 Seconds VM2 - Delay 100 Seconds VM3 - Delay 0 Seconds The VM3 instead of starting first, always starts last without fail. One difference I noticed is that VM3 is UEFI vs VM1 & 2 being in BIOS mode. I read elsewhere in the forum that vApps is the only reliable way to have an order. Maybe if we can somehow ensure that delay works, vApps will become less significant ?