I have been in IT for almost 20 years and have always used a tape backups solution for mission critical data. I am in a new shop with a bunch of youngsters who are telling me that a hard drive based backup is the only way to go.
I don't want to be an old fuddy duddy but I see problems with going to a hard drive solution. Not the least of which is the difficulty of taking the backup offsite.
We have a little over 270G of databases and flatfiles to back up and are expecting that to be pushing 1T by the end of next year.