Hi Tony,

Excuse me for my late reaction but today i looked into this issue again with no success

1. VM [NOBAK] option and snapshot error in XO
   I added the [NOBAK] quotes to the name of the disk i want to skip the transfer for and fired a manual snapshot job. Almost instantly i get the same error as mentioned before, screenshot and error details below.

vm.snapshot
{
  "id": "b95f5a0e-3694-8066-ecb4-f72294d13f8a"
}
{
  "code": "UNIMPLEMENTED_IN_SM_BACKEND",
  "params": [
    "OpaqueRef:9bfbc055-40c4-44a0-ab1a-9f3bac6dc718"
  ],
  "task": {
    "uuid": "175c0c3f-d480-c769-31eb-423f8fe21aa9",
    "name_label": "Async.VM.snapshot",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20200923T14:40:20Z",
    "finished": "20200923T14:40:22Z",
    "status": "failure",
    "resident_on": "OpaqueRef:f03bc02e-9087-41f4-b0ac-c57f3f5220dd",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "UNIMPLEMENTED_IN_SM_BACKEND",
      "OpaqueRef:9bfbc055-40c4-44a0-ab1a-9f3bac6dc718"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [
      "OpaqueRef:c6ae9555-aec8-40ca-809a-4be54d852987"
    ],
    "backtrace": "(((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 60))((process xapi)(filename list.ml)(line 106))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 94))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 102))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 136))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 162))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 168))((process xapi)(filename list.ml)(line 117))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 170))((process xapi)(filename ocaml/xapi/xapi_vm_clone.ml)(line 381))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/xapi_vm_snapshot.ml)(line 31))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 100))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 236))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 83)))"
  },
  "message": "UNIMPLEMENTED_IN_SM_BACKEND(OpaqueRef:9bfbc055-40c4-44a0-ab1a-9f3bac6dc718)",
  "name": "XapiError",
  "stack": "XapiError: UNIMPLEMENTED_IN_SM_BACKEND(OpaqueRef:9bfbc055-40c4-44a0-ab1a-9f3bac6dc718)
    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/_XapiError.js:16:12)
    at _default (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/_getTaskResult.js:11:29)
    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/index.js:866:24)
    at forEach (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/index.js:887:14)
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/index.js:877:12)
    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202031082325/packages/xen-api/src/index.js:1038:14)"
}

2. Installing guest tools on FreeBSB (FreeNAS)
   The xcp-ng documentation page describes that you will need to install 2 ports manually on FreeBSB. On following the instructions for let say sysutils/xe-guest-utilities on freshports[dot]org page it says to run the following commands:

To install the port: cd /usr/ports/sysutils/xen-guest-tools/ && make install clean
To add the package: pkg install xen-guest-tools

First command seems to fail on 'make' and second command i entered just to see what the output would be.