TimeMachine Big Sur to Synology NAS

After upgrade or new install of Big Sur, TM backup stoped working to Synology NAS using AFP or SMB3 protocol. TM to external USB works fire and other 4 mac's with Catalina can create TM backups to the same NAS without a problem.

MacBook Pro 13″, macOS 11.0

Posted on Nov 15, 2020 7:58 AM

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Posted on Jan 8, 2021 1:10 AM

i was able to solve the problem after update Cisco AMP. With Big Sur and Cisco AMP Version 1.14.0 the TM backup doesn't work. After upgrading to Cisco AMP Version 1.14.1 every works fine.


another MBP with Catalina has no Problem with TM and Cisco AMP Version 1.14.0. The Backup is terminated on the same Synology.


Thanks everyone for solve the problem

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81 replies

Dec 11, 2020 9:10 AM in response to TexanInParis

As far as Big Sur is concerned, everybody needs to forget AFP as it has been deprecated. Also, everybody needs to get off the concern regarding APFS with respect to network backups - as those drives are not formatted in APFS. The issue is third party antivirus/malware protection, and in particular, at least in my case, Sophos. Sophos has documented that it breaks Time Machine network backups, and still has inexplicably failed to fix it. In about 20 seconds I'm going to dump them forever.

Jan 3, 2021 3:54 AM in response to alkocelj

I was able to get it working by following the steps in this article: https://www.synology.com/en-us/knowledgebase/DSM/tutorial/Backup/What_should_I_do_to_fix_the_problem_when_connecting_to_Synology_NAS_using_Time_Machine

I have one user with access to the shared Time Machine Folder on the NAS. I have only SMB enabled and left the advanced settings for SMB as default.

TM is backing up now, keeping my fingers crossed that this is not a recurring issue.

Nov 15, 2020 8:22 AM in response to alkocelj

If you have the latest version of the Synology's DiskStation Management (DSM) software installed, and rebooted the Synology, then you need to visit Synology support to see if there are initial issues with Big Sur compatibility. Though I am not using my Synology for Time Machine backups, my older DSM 5 software still allows me to mount shares to Big Sur, and access that content in the Finder without any changes to the Synology or Big Sur settings.

Dec 28, 2020 2:15 AM in response to Flitter2009

My NAS is Allison on this version. I updated my Mac Mini (final Intel version) yesterday. I also checked too ensure the NAS was only using SMB 2/3 (although it unhelpfully describes the connection as CIFS). I use the same account for time machine as I do to access the NAS. Backup ran smoothly and continues to do so. Not sure if this was due to the .1 release of MACOS or release 3 from Synology, but all appears to be well!

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TimeMachine Big Sur to Synology NAS

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