Backup is important to take care of. If you forgot to make backup, some data could be lost due to virus, server crash or broken hard disk of the server. Usually, web hosting will done backup weekly for us.
I still remember once when my blog suddenly can’t be access because the hard disk of my web hosting provider suddenly broken. I got lucky because they had backup prepared. How about if they have no backup? Furthermore, the backup they have is not up to date, that means I still lost …