Time Machine hangs on Time Capsule and external HDD
I have used a Time Capsule ("N") for backups for over a year without issue. Recently got a message that I hadn't backed up in 15 days and initiated a manual backup. It failed. Never got past "Preparing".
My wife's MacBook is continuing to backup to the same Time Capsule without issue.
I ran Disk Utility Repair on my MacBook and on the Time Capsule. No improvement.
Tried attaching the MacBook directly to the Time Capsule with ethernet. No luck.
Hauled out a 1 TB WD My Book Studio and erased/formatted it. Connected to USB and began to backup. It got past Preparing and stopped at about 300kb. Very much like this questioner, I had varying luck with several restarts. [I cleared the "In Process" sparse bundle each time and did a restart of the MacBook.]
Finally got to about 145GB of 288GB after about a day of running. The system stopped at that point (I left it overnight and it didn't increase). Erased and reformatted the disk and tried again. Got to about 50% backed up again and stopped.
Repeated all of this with another external HDD a Hitachi 1TB. Same result as with the WD.
Just unwrapped a brand new Samsung SSD (500gb), put it into a USB 3.0 enclosure and formatted it; started Time Machine back up. Running faster than earlier attempts but after about four hours it has again stuck at about 50%.
I'm out of ideas.
MacBook Pro (mid-2012)
2.9GhZ Core i7 processor
8gb RAM
OSX 10.13.3
MacBook Pro, iOS 10.3.3