When the time machine backup starts, the speed of the backup, as reported by the progress window, seem fine. I have a USB 3 disk and it reports 60GB will be backed up in about an hour. For the first 5 minutes, all goes well, with about 7GB getting backup up.
Then about 5 minutes later, 7.5GB is backed up and the dialog report that it will be 3 hours. After an hour 7.8GB is backed up and it's going to take 13 hours. 1/2 half an hour later 7.8GB is backed up and it's up to 14 hours.
- I have checked my disk using Disk Utility and it reports no problem.
- I repaired permissions
- I stopped the indexing service
- Restarted the computer
- I copied a large directory, about 1 GB in size, several hundred files, onto the backup disk using Finder and the copy took about 30 seconds. This is while the backup is hung.
- Console doesn't report much, but when it slows, it just keeps repeating the same line 'Copied X GB of Y GB. J Items of K Items' over and over
I have actually made several attempts at this, removing the partial backup and trying again, even letting it run overnight. The numbers are different, but I'm getting the same basic result. It hits a certain point, and slows to an imperceptible level. Sometimes at 500Mb, sometimes at 5Gb, now at 7.89Gb (and 16 hour).
I don't think it's the external disk, since it starts with no problems and I can copy files onto it with good speed. I don't think it's the computer's disk, since I have no other performance problems. I have OS X 10.7.5 Lion, all software up to date.
Any suggestions on how to troubleshoot this? Thanks.