I am running the latest XO. I ended up fixing the issue, it has backed up successfully 2 times now without any errors. What I did was removed ALL snapshots for the specific VM. Once the tasks finished for removing the snapshots, I created a new manual snapshot. Then let the backup happen as normal. What I noticed though is the backup snapshot replaced my manual snapshot so the VM still only has 1 snapshot. But it seems to be working now.

@HamiltonWDS Thanks for the report. As it works with wget let use it! I'll switch from curl to wget in doc. In the meantime some colleagues will investigate more.

Great! @jkissane please open a new thread if you want to continue discussing your issue