Video backup method/practice

[khngai]

Hi! Anyone can recommend what is the best method for backing up video images. Any useful web sites recommended? What is the normal practice?

Say, I've 2 sites with NVR installed. Should I need to back up the images of that two NVR into a central back up devices; said tape library; how shall it be implement? If back-up thrrough network, will congested the network..??

Please advice.

Thanks a lot.