I can suggest that you save frames of the video instead of saving the video stream. This saves you a lot of diskspace and does the job.
Steps of making the DNS 323 as a cheap IP camera recorder.
1. You need to configure the DNS 323 as an FTP server.
2. Define a specific folder in the NAS and label it e.g. Cam1.
3. Define a user account in the NAS and call it Cam1.
4. Allow user account Cam1 to access Folder Cam1.
5. Configure the IP camera's FTP settings. It should be pointing to the 323's IP address.
6. You can configure the IP camera to send X number of video frames to the 323 based on the IP camera's capability to record based on a either of the triggers (i.e. detect audio, motion, or continuous recording).
if you want to view the video frames from Cam1, you can login to the FTP server from your windows PC.
1. Open your Windows explorer.
2. Type ftp://<ip address of your NAS>:21
3. Type your username and password for user account Cam1 when prompted.
4. And viola, video frames in the form of individual photo frames. There is no video per se but you can scan the photo frames. If you know the time frame that you are looking for, just check the time stamps on the file and you'll find specific segments of the video.
If you want to add more IP cameras, just define more Cam folders and Cam user accounts per camera. With some fancy settings in the DDNS, you can access your recorded video frames through the internet or you can also configure the IP camera to send the the video frames to a remote 323 FTP server anywhere in the Internet.
If you need more assistance on this, you can write to noneeno@tahoom.com. I can assist you configure your set-up for a minimal fee or even do the whole configuration remotely.