When it comes to online backup I only backup online my most important files, such as my personal writings which I intend to publish one day... If I lost those, I would lose years of work.
But I also create a full backup of my hard disk to an external hard disk, and I also create a backup of my hard disk onto DVD's.
I think online backup should only be used to supplement other forms of backup.
Anyway, I am working on creating a site about
backup.
It is interesting to read about other peoples backup strategies and experiences!
