More like 90% for me
I wish specific information was provided on why it doesn't work more than 40% of the time.
I'm surprised so many people report no problems -- for me, this has been a absolute piece of crap since the first time I've used it, and various updates have never improved it.
Problems:
- 99% of the time, the backup will stop at the very end with an error that the backup media is in use and cannot be ejected. This is an external hard drive -- (a) it's supposed to be in use, and (b) there is no need to eject it. Hitting retry anywhere from 1 to 30 times will usually clear the message. But this completely defeats the purpose of having automated backup software -- if I have to be sitting at my keyboard to click 'Retry', I could have just done the whole backup manually in the first place.
- The software will continue doing incremental backups until doomsday. It's not smart enough to do, say, a weeks worth of incremental backups, then do a new full backup so that I don't have to keep over 300 backup files per year. Common sense, any serious backup software supports this, and yet Backup can't grasp the concept.
- Recently, for no reason I can figure, it has decided to start doing my
backups mid-morning even though it's configured to go at 6pm nightly.
- Single-threaded. There is no reason why it can't be doing 3 different backups to iDisk, DVD, and external drive at the same time, but instead it waits until one completely finishes before starting the next.
The first one is really the only serious defect, although the second is a pretty glaring design deficiency. Maybe TimeBomb, er, Time Machine will address these issues.