- Some others have been burnt by the cloud failing them (corruption, data loss, copyright abuse, etc) and want an additional layer of security.
- There are many activities that are fully not covered by the cloud, such as 3D / video / music edition, art in general, programming (all those dev envs)...
- You may want / need to be able to be able to recover from a dataloss even if you are offline.
- Some file types don't match the cloud sync paradigm very well such as system and configurations, non online game saves and all stuff that needs to be at a precise place on the system.
- You got stuff you want to manipulate as files in dirs, not as an entry into app. Power users usually dislike the loss of control and freedom the apps imply.
- You like to have 3 backup because of the rule "one on site, on off site".
- You like to have all your backups at the same place.
- You have collections off files that just don't fit in the cloud, such as Tera of Videos.
- Sex tapes still need to be backed up, and you won't send that to your dropbox.
- Some people still have a shitty internet connections and can't sync reliably.
- It's less work to manage one backup than to setup all the parameters of all those apps to be sure they sync only what you want.
- You read the licence for some sync plateform and couldn't decently click "I accept".
- You got a NAS at home on which you plug your hard drive with the backups for the whole familly.