I got the same error again today.
It's a delta job with two remotes.
[image: 1617015537043-fe12531c-52e2-4457-bc13-ee36db7f4fb5-image.png]
Even though it says the backup failed, it looks like it is available on both remotes:
[image: 1617015649230-ca6eabb8-f810-44ac-bce0-7079755bc7de-image.png]
srv01 = pool member
srv02 = pool master
srv03, srv04 = backup remotes
XOA runs on srv02
The error seems to imply that it can't resolve the hostname of srv02, but that seems rather odd. I am using static IP only.