An error occurred while copying file

Time Machine couldn"t complete the backapproximately "WDMyCloud".

You watching: An error occurred while copying file

An error arisen while copying files. The trouble may be momentary. If the difficulty persists, usage Disk Utility to repair your backup disk.

The drive itself is a 3TB Western Digital My Cloud NAS. I have the right to mount it in the Finder and also it appears to be okay (in that I have the right to browse it and also open up files), yet it does not show up in Disk Utility at all, which doesn"t seem appropriate...

I ran the full diagnostics test in WD"s utilities (it exposes a page at wdmycloud.local when the drive is powered on) and also it reported no difficulties.

I"ve tried rebeginning both the drive and also my MacPublication Pro, which didn"t aid.

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Is this a fixable difficulty, or is my drive dying? I"d be surprised if it"s the latter, considering that it"s much less than 3 years old, sits untouched next to my rexternal in a well-ventilated location, and aget the diagnostics reported no concerns.

time-machine external-disk error nas
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edited Jan 9 "17 at 16:41
asked Jan 7 "17 at 14:32

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4 Answers 4

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Looking for backup errors in the log, what I found was ; backupd<3278>: objc<3278>: __weak variable at 0x7f9227c07600 holds 0x7f9227c00003 instead of 0x7f9227c0e060. This is most likely incorrect usage of objc_storeWeak() and objc_loadWeak(). Break on objc_weak_error to debug

Searching for these terms, I found this solution, which solved my issue:

theperlarsen Dec 27, 2016 9:40 PM in response to theperlarsen Level 1 Level 1 (4 points)Dec 27, 2016 9:40 PM in response to theperlarsenSOLVED: Turning off iCloud Drive resolved the concern for me.

The weak variable error in the console is misleading. The logging device was readjusted for macOS Sierra. Use the paste command also into a terminal to check out time machine errors:

log present --predicate "submechanism == """ --information --last 4h | grep Error

I saw lines containing beginning with:

Error: (-34) SrcErr:NO Copying Copying /Users/myusername/Library/Mobile Documents/ ...

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The mobile folder is supplied by iCloud drive, so I turned that off. That enabled the backup to complete. Hope this helps others that are suffering this concern. Hopecompletely the final version of 10.12.3 fixes this.