What application do you use to back up?

I've heard iBackup is good.
It copies everything, so you can actually use the data of the target disk to do stuff.
Try searching for it.

 

Backup, backup, backup.

I use Apple's Backup to backup to my external hardrive.

 

I use Déjà Vu

 

SuperDuper. Others need not apply.

 

I second that!

 

ChronoSync

 

For just normal back ups of files, and music/movies I use Toast.

But for a home folder, boot backup, superduper, or apple's back up

 

Super Duper is Super Duper.

 

Ditto.

 

Dantz Retrospect: not for the faint-hearted

 

I used to use that but it was slow as anything to restore anything so I switched to Déjà Vu

 

Carbon Copy Cloner

Carbon Copy Cloner

Easy to use. Free. Bootable back-ups.

 

In the future, a search like this one: http://forums.macrumors.com/search.php?searchid=3556944 will give you the exact same answers since this question is usually covered about 3 times a day.

I use SuperDuper.

 

Since no-one has mentioned it yet: LaCie SilverKeeper is really ugly, but seems to do the job very well... and you cannot beat the price, either...