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Time Machine won't backup after upgrade to 10.14.4

After upgrading to 10.14.4, I get the following error when trying to back up my iMac using Time Machine. "Time Machine did not back up because FileVault was encrypting or decrypting a disk. Backups will resume once FileVault finishes." It's been like this for over 26 hours. FileVault is not even turned on for this iMac drive.

iMac Line (2012 and Later)

Posted on Mar 27, 2019 9:46 AM

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Posted on Apr 5, 2019 6:03 PM

I spend some time on the phone with support and we reset the SMC and the NVRAM and it's been working since then. Time Machine has backed up several times and I am not getting the error. Fingers x'd it stays that way.


Reset NVRAM or PRAM on your Mac 

How to reset the System Management Controller (SMC) on your Mac 

56 replies

Apr 12, 2019 11:32 AM in response to rocabrol

warmd controls caches used during startup and login. It is a launch daemon started by launchd during boot and is not meant to be invoked directly.


Could be a corrupt cache file. Boot into Safe Mode, to clear out the system caches. Reboot normally and check Activity Monitor again.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing some system cache cleaning, volume verifying and directory repairing.


Mar 31, 2019 2:21 PM in response to CliffM146

had same problem after upgrade to 10.14.4



was able to fix and get time machine back up again with help from Apple support - after doing a forced hard shutdown and restart.


hold the on/off button until the system shuts down (all unsaved work will be lost). then restart by pressing the on/off button.


note - it did not fix the issue when I forced kill all open applications, or a restart of mac os. it needed the hard shutdown/start in my case.



Apr 7, 2019 8:17 AM in response to Miles288

Same problem since on the 4th of April installing the latest Mojave upgrade. Tried everything mentioned above and on some other threads, including the "Reset of NVRAM or PRAM" — and nothing has worked. After that reset and after previously turning off the Mac and unplugging it several times, I got one finished backup each time then the same problem and message (Time Machine did not back up because FileVault was encrypting or decrypting a disk. Backups will resume once FileVault finishes). Never turned on FireVault, and checked in the Activity Monitor that is was off.


I have three external backup drives with my desktop. Two are connected to the USB3 ports, one to a hub. I've run the Disc Utility First Aid on all, and on the computer's internal HD, and all checked out.


Maybe replacing the interior battery is the last step?





Apr 8, 2019 11:14 AM in response to Arnold Layne

Same problem here. I have even installed 10.14.4 new via recovery ... didn't change anything. Time Machine will only run one time, than the error "FileVault bla bla bla" occurred. FileVault is not running, and never was. Even checked via fdesetup. A restart will "fix" the problem, but only for one backup. Than the same error occurs again until the next restart... very annoying.

Apr 8, 2019 11:28 AM in response to Old Toad

safe boot or any of their two suggestions did not work for me unfortunately.


Hard restart, backup worked once - is a workaround for some of us (not everyone has this ongoing TM issue).


it’s recommended to contact Apple support and get this issue logged, for those of us having to live with this bug ?

I have had two sessions online chat with Apple, and two phone calls from Apple and so far they have gathered info from my macOS to pass on to their macOS team with no fix yet. but I use the workaround suggested above in the meantime.

Apr 8, 2019 3:13 PM in response to eagle

I went through all the procedures again this afternoon. Why not? If what you've been doing doesn't work — do it again and again. So I did the hard shut-downs, reset SMC, reset NVRAM and PRAM, all per instructions, ran Utility First Aid on the internal HD, and on all three external backup discs . . . Waste of time. As before: one finished TM backup, then the usual message about waiting for the FileVault (which was never on) to finish. Arrrggg.


Apple seems to have a pattern of denial and delaying fixes.

Time Machine won't backup after upgrade to 10.14.4

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