My MacBookPro with a 500GB SSD and OS X 10.11.6 uses an external Synology for Time Machine back-ups. Everything was working just fine until a couple of days ago, when I noticed that the back-ups started failing. First thing I did was take it down to where the wifi is to improve the speed of download and no improvement. It keeps bombing out about half way through the back-up. My iMac and Mini are still backing up just fine, so I think it must be the laptop's SSD. I run a first aid from Disk Utility and it reports that there is an incorrect number of file hard links, Drive is corrupt and must be repaired, and file exit code is 8. Also says OK. I restart the machine and run disk util again, and this time it says nothing about corruption and does say feel exit code is 8, Operation successful. I force another back-up and get, 138 GB ion 537 GB available. Back up x of 543 MB. It starts off real slow (3 or 4 mb) then jumps real fast to 308 mb and then slows down again and fails. I'm at a loss at why it won't back-up and the exit code 8 kinda scares me.