Optical media might not be as reliable as we thought, conventional hard drive seems the best.
With the growing data size from digital camera, video recording and digital music, we are facing tremendeous need on storage. Upgrading hard drive could solve the problem of storage, but how to solve the problem on backup?
Buying a big external storage could be a proper backup solution, but just like the problem of storage, the problem of backup is just growing as quickly. Right now my strategy is to use older hard drive as backup, what I'm doing is that:
1. Clean up older hard driver, so that no more software would be there, the space would be used solely for data
2. Copy all the data there, e.g: photograph, music, video, etc.
3. Disconnect all the power and cables, this could elongate their life
And afterward, we will need to update the data periodically so that the backup is closer than the real data.
This will work, for example in my case, my last hard drive is a 170G one and the new one is 350G. Give the existing one is about to fill up (only around 30-40G of free space), I will go for a bigger one.
But then the older two will be enough just for backup purpose. The chain goes on, and only the biggest two would be required for backup, and the smallest ones could be thrown away, or for backup even more important data which does not require any further updates.