@Danp Thanks... Just ticked that off and they are migrating. I'll try backup again but something tells me the backup issue will still persist. I'll send logs once that fails.

My VM's had issues with backups and won't complete a back up. That's one problem. The other problem is that I can't migrate the VMS between hosts live. I think the disks are in some locked state. My guess is that one is feeding into the other. Any advice on how to unlock the disks/remove the metadata tag that tells XO that they are locked in a backup process (even though none are running)? Thanks.

vm.migrate
{
  "vm": "ec579a69-197e-61b8-4425-3223ec87e534",
  "targetHost": "f4201c8e-3f1c-40a9-a037-2410a17b0630"
}
{
  "code": "OPERATION_BLOCKED",
  "params": [
    "OpaqueRef:627d80f5-cfc4-4491-ba4f-4c66fef27d6f",
    "VM migration is blocked during backup"
  ],
  "task": {
    "uuid": "ba1cc870-4380-2e36-71a2-2794c97c0a8e",
    "name_label": "Async.VM.pool_migrate",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20250809T10:56:50Z",
    "finished": "20250809T10:56:50Z",
    "status": "failure",
    "resident_on": "OpaqueRef:d4738540-7918-d2ed-28dd-33cc32ef2c6c",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "OPERATION_BLOCKED",
      "OpaqueRef:627d80f5-cfc4-4491-ba4f-4c66fef27d6f",
      "VM migration is blocked during backup"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi/xapi_vm_lifecycle.ml)(line 743))((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 1652))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/libs/xapi-stdext/lib/xapi-stdext-pervasives/pervasiveext.ml)(line 39))((process xapi)(filename ocaml/xapi/helpers.ml)(line 1706))((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 1651))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 2478))((process xapi)(filename ocaml/xapi/rbac.ml)(line 188))((process xapi)(filename ocaml/xapi/rbac.ml)(line 197))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 77)))"
  },
  "message": "OPERATION_BLOCKED(OpaqueRef:627d80f5-cfc4-4491-ba4f-4c66fef27d6f, VM migration is blocked during backup)",
  "name": "XapiError",
  "stack": "XapiError: OPERATION_BLOCKED(OpaqueRef:627d80f5-cfc4-4491-ba4f-4c66fef27d6f, VM migration is blocked during backup)
    at Function.wrap (file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/_XapiError.mjs:16:12)
    at default (file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/_getTaskResult.mjs:13:29)
    at Xapi._addRecordToCache (file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/index.mjs:1073:24)
    at file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/index.mjs:1107:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/index.mjs:1097:12)
    at Xapi._watchEvents (file:///opt/xo/xo-builds/xen-orchestra-202506300620/packages/xen-api/index.mjs:1270:14)"
}

Xen Orchestra, commit 93503 (from sources) up to date
XCP-NG up to date

Running into the same thing here myself

Seems that the issue is on the latest version. I had the same issue and rolled back to:

xo-server 5.102.3
xo-web 5.103.0
Xen Orchestra, commit 9d09a

Rolling back fixed the issue. Guess I'll wait a bit for the issue to resolve in a further patch.