Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Curious what problem you have with Time Machine over NAS. I use that and it has worked well. BTW, I use QNAP NAS
Not much, only backup volume corruption every few months. More likely to occur when the network connection breaks mid-backup. It's enough to make me stop network-based Time Machine and go back to USB hard drives.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.