I found a solution for MaxDB 7.7:
1) Create a DB Full-Backup to /dev/null
2) Enable Autolog
3) SnapCreator Config-File:
PRE_APP_QUIESCE_CMD01=truncade_script.bat
truncate_script.bat:
dbmcli -U netapp db_execute force savepoint
dbmcli -U db_execute save data quick to 'Netapp' external
4) As a local admin use xuser tool:
user -c domain\user -U netapp -u dbusername,dbpassword -d dbname -n hostname