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Time Machine not backing up automatically but w...

I don't know how many of you all have experienced or noticed this problem, but I've had this happen on all 3 of my Macs running Sierra.  Suddenly and randomly, Time Machine stops automatically backing up but manually triggering a backup works fine every time.  I've even recorded the Time Machine prefpane incrementing the "next backup" time without any status change or trying to back up.  System logs?  Not a single entry from backupd/TimeMachine about running or failing to run.  Just silence.

I don't know what or if this has an effect on the automatic backups, but I've noticed this process running and it doesn't seem to respawn or come back right away so I don't know what triggers it.

/System/Library/CoreServices/backupd.bundle/Contents/Resources/TMCacheDelete

I tried restarting backupd, I disabled/enabled the Time Machine backups, none of that caused Time Machine to automatically start backing up again.  However, after I killed the TMCacheDelete process Time Machine kicked off a backup and has been backing up every hour again since then.

If you're having this problem, see if "TMCacheDelete" is running (Activity Monitor or using your terminal app of choice), if it is then kill it and see if Time Machine starts backing up again, either shortly after killing the process or when it says the next backup is supposed to run.  If this works for others then I'll submit a bug/feedback so that hopefully this can be looked into and fixed.

Well, it wasn't TMCacheDelete that was blocking Time Machine.  So scratch that.  No idea why Time Machine stops backing up automatically. 

Same issue. Time machine mysteriously doesn't do regular backups to my locally plugged in external hard drive. If I click "Back Up Now", it backs up, but then may or may not resume regular backups. Running Sierra 10.12.3. It seems like these types of "glitches" are increasing.   

I've found that running "sudo tmutil disable" and then "sudo tmutil enable" from the command line works consistently to get Time Machine working again, until it decides to stop.  I may just schedule a task to issue a disable/enable daily.

I have other issues with TM

mail backup with time machine

which makes me very nervous that Apple isn't testing their products well enough... and they have no answer/fix for my problem. 10.12.3 did nothing to fix the problem.

Maybe make products that "just work" rather than worring about the next big thing!

Same problem here.  I'm backing up to a QNAP NAS.  Works regularly for a while then stops.  Rebooting my MacBook Pro and the NAS makes Time Machine work regularly for a day or two - then suddenly I notice it's not backing up any more.  Very annoying!

Just an update, ever since updating to 10.12.4 my TM backups have been running on schedule without a hitch on multiple Macs of mine.  Not sure why or if this was a bug fix, but if you're having problems and haven't updated to 10.12.4 yet then give it a shot.

Thanks FarmerTed, for the reply.

I wasn't even aware of the latest OS Sierra update.  I'm still running 10.12.3.  I'll update now and see if it fixes the problem.

Seems I spoke too soon.    Time Machine has resorted back to its old ways after working perfectly for a week.

I found TM & Mail to work for a while then not.

The problem is: I can't see previous days backups for "On My Mac" email folders.

A tech suggeted a hardware test: https://support.apple.com/en-us/HT201257

It came out OK, so it must be software... and 10.12.4 did not fix... UGH.

I am experiencing this problem too: Time Machine backups are not reliably occurring automatically.

- MacOS Sierra 10.12.4

- Mac mini (Late 2014): 2 TB external USB 3.0 drive

- iMac 27-inch (Late 2015): 2 TB external USB 3.0 drive

- MacBook Pro (Late 2015): Apple Time Capsule (Mid 2013 802.11ac model)

Start with A4 in the 1st linked article.

Time Machine Troubleshooting

Time Machine Troubleshooting Problems

Thanks for the suggestions, but no change.    Just strange that it would work fine for days after upgrading to 10.12.4 and then stop working again out of the blue.

So, now I have my cron re-enabled to do a tmutil disable/enable every 6 hours, which also triggers a backup.

Thanks, those standard troubleshooting steps did not lead to a solution but by the process of elimination they have demonstrated that Time Machine has a defect in MacOS Sierra 10.12.0 - 10.12.4. The reliability issue affects backup targets connected via both:

- USB / ThunderBolt (Western Digital, SeaGate, LaCie, etc)

- wireless/wired networks (Apple's own Time Capsule, NAS devices, etc)

Options for next step:

- Call Apple Support: first-level troubleshooting and being escalated to second-level support will not resolve the issue, wait to see if the next OS update resolves the issue, while in the meantime manually triggering Time Machine backups whenever the automatic backups fail to happen

- Give up on Time Machine: look into paid alternatives like SuperDuper, Carbon Copy Cloner, ChronoSync

The safest next step is to implement a new automatic local backup solution for my desktop Macs:

- SuperDuper: $28

- Carbon Copy Cloner: $42

- ChronoSync:  $50

- ChronoSync + ChronoAgent bundle:  $60

Chronosync appears to be the only option for an automatic wifi-based local backup solution suitable for a Mac laptop.

Off-site backup services (BackBlaze, CrashPlan) and cloud services (Dropbox, iCloud) are not as practical for recovery as a local backup and so should only be used in conjunction with a local backup solution.

Despite:

- rumours that Apple will no longer develop their own Airport wireless base stations

- not updating their existing Airport and Time Capsule wireless base stations with new hardware since summer 2013

Apple is today STILL selling those 4-year-old Airports and Time Capsules in their own online/retail store and at resellers for the same price they charged in 2013 (in some countries the price has actually increased since 2013).

Krag's post above conveys my own frustration and annoyance:

- "Apple isn't testing their products well enough"

- "Make products that 'just work' rather than worrying about the next big thing"

My Windows 10-based desktops, laptops and tablets are ALL backing up reliably and automatically to my Apple Time Capsule and various external USB drives via the backup feature built into Windows 10.

It frustrates me that Apple can't be relied on to do the same.

I'm not in a position to test this (very easily done). In the early days of 10.11, there was an issue with TM automatic backups which was subsequently fixed in an OS update. It turned out that the issue was caused by code within the OS that prevented auto backups when the Mac was being powered by battery. When an uninterruptible power supply (UPS) was stationed between the mains and the Mac, the OS interpreted that as the Mac being powered by battery.

If you're using a UPS, try running directly from the mains. It might require a reboot before the OS forgets the UPS.

最后更新：2017-08-18 10:57:08

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