Hi and thanks for your answer.
Yep, I had aldready put the device's sysOID in the adapter-file, under IOS-XR.
There is no "backup_running_config_scp.tcl" in the CiscoIOS_XR folder.. CLI or TFTP method is not applicable in our environment, it must be SCP.
The log iMC\server\conf\log\imccfgbakdm<datestamp>.txt contains the following..
2019-11-12 09:39:04.382 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::checkAccessTypeMatchTransferProtocol()] transfer protocol does not match access type,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:04.382 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::isDevSupportServiceAction()] transfer protocol does not match access type,ServiceName = ConfigBackup,commandName=ICC,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:04.383 [WARNING (102)] [THREAD(3906939760)] [qvdm::QvGetConfItem] Fail to get item[thirdpart_scripts] in file[/opt/iMC/server/bin/../../server/conf/qvdm.conf].
2019-11-12 09:39:04.384 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::checkAccessTypeMatchTransferProtocol()] transfer protocol does not match access type,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:04.384 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::isDevSupportServiceAction()] transfer protocol does not match access type,ServiceName = ConfigBackup,commandName=Custom,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:04.384 [ERROR (18)] [THREAD(3906939760)] [CComponentAdapter::isDevSupportServiceAction()] fail to call getDevAdapterName().DevID=4175,ServiceName = ConfigBackup
2019-11-12 09:39:04.384 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::checkAccessTypeMatchTransferProtocol()] transfer protocol does not match access type,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:04.384 [WARNING (32)] [THREAD(3906939760)] [CComponentAdapter::isDevSupportServiceAction()] transfer protocol does not match access type,ServiceName = ConfigBackup,commandName=ICC,iTransferProtocol=4,iAccessType=3
2019-11-12 09:39:14.387 [ERROR (18)] [THREAD(3906939760)] [CScriptProcessor::exec()] Failed to execute by cli method.