I get this error regularly, and I'm doing a *wired* backup over gigabit Ethernet.
The Garth Gillespie fix doesn't work for me, either (even with the alternate "if this fails..." fix):
iMac-3:~ root# fsck_hfs -drfy /dev/disk3s2
journal_replay(/dev/disk3s2) returned 0
Using cacheBlockSize=32K cacheTotalBlock=81920 cacheSize=2621440K.
Executing fsck_hfs (version hfs-226.1.1).
** Checking Journaled HFS Plus volume.
** Detected a case-sensitive volume.
The volume name is Time Machine Backups
** Checking extents overflow file.
** Checking catalog file.
** Rebuilding catalog B-tree.
Extent records for rebuilt file 4:
[ 19697618, 210 ]
[ 991841, 208 ]
[ 19687630, 344 ]
[ 19697030, 273 ]
[ 61058765, 295 ]
[ 8729268, 305 ]
[ 19689209, 462 ]
[ 64026391, 84431 ]
hfs_UNswap_BTNode: invalid node height (1)
btree file 4: 1000 records
[additional btree file info omitted]
RebuildBTree - InsertBTreeRecord failed with err 35 0x23
RebuildBTree - numRecords = 103001
RebuildBTree - record 50 in node 2397 is not recoverable.
xxxxxxxx BTreeKey (length 8) xxxxxxxx
06 00 3A CB 00 00 00 00 ..:.....
xxxxxxxx BTreeData (length 52) xxxxxxxx
04 00 00 00 39 CB 00 00 15 00 54 00 72 00 61 00 ....9.....T.r.a.
6E 00 73 00 6C 00 61 00 74 00 65 00 64 00 53 00 n.s.l.a.t.e.d.S.
74 00 72 00 69 00 6E 00 67 00 73 00 2E 00 74 00 t.r.i.n.g.s...t.
78 00 74 00 x.t.
** The volume Time Machine Backups could not be repaired.
volume type is pure HFS+
primary MDB is at block 0 0x00
alternate MDB is at block 0 0x00
primary VHB is at block 2 0x02
alternate VHB is at block 5641594414 0x15043e62e
sector size = 512 0x200
VolumeObject flags = 0x07
total sectors for volume = 5641594416 0x15043e630
total sectors for embedded volume = 0 0x00
CheckHFS returned 8, fsmodified = 1
May I suggest code42 software. It allows backups to several different locations at the same time. The software is free. If you back up to their vault you pay for the storage. I do confess that the user interface is confusing. I back up to their vault and to a local mini. I'm also using Time Machine to an apple wireless tower. Between the three options, I seem to be covered. When TM screws up, it is merely irritating vs disastrous.
I think I paid $50 for 3 years of their vault, but the prices have since gone up.
I've got word that this is fixed in 10.9.5 (latest Mavericks). My informal testing seems to agree – I haven't been experiencing it although I have deliberately disconnect the network a few times while Time Machine is running.
If you've upgraded to 10.9.5 and still experiencing the same issue, please collect diagnostics data, file a bug report and mention the original bug number: #15560145.
To collect diagnostics, go to Terminal and then run the following command:
It will generate a report on the desktop. You'll need to attach this file on your bug report. It would be best if you run this command before you start a new Time Machine backup (e.g. while the "start new backup" prompt is still showing).
No, not fixed for me on 10.95. I've had a new imac + Time capsule (backed up over ethernet) since Jan 2014, and todays "Cannot back up etc..." is the third, so about once every 3 months, regularly. Not good enough obviously; full backup aside I lose the continuity. I haven't had the time, but I'm sick of this and will try calling via Applecare - they've been good in the past. I've got no doubt Yosemite won't be a fix for this.
I'm surprised, as I had two previous TCs running for 5 years under 10.58 without problem, except for one packing up after two years, replaced under warranty. It's interesting to hear the problem is not limited to Time Capsules.
I've missed the boat on the diagnostics this time, but I'll make a note for the next time this happens - no doubt it will.
I just discovered this issue last night.
I'm using a WD drive connected via USB to my MacBook Air with 10.10.1
The 250gb backup finished but somehow corrupted he driver to where it says it needs to be formatted again.
This same thing happened when I attempted to backup via wireless with my Airport Extreme.
The OS/Time Machine def does something to the driver over a period of time that corrupts it.