Time machine doesn't show QNAP TS-239 NAS as a possible backup drive. The NAS is connected via devolo d-lan from my router. I can read and write files there (althogh NTFS) since SL NTFS is installed. Anybody got a clue? Do I have to convert the drive to FAT, use bootcamp...?
First, Time Machine needs that the backup external drive has to be formatted in Mac OS Extended (Journaled). Then, you can't use a network drive to make backups unless you have the most recent AirPort Extreme > http://pondini.org/TM/Airport.html
If you want to make backups, you have to connect the NAS directly to the computer. See > http://support.apple.com/kb/HT1427