10.0.3 update killed Time Machine backups

Hello Brian,

my name is Frank and I'm an engineer here at Sophos and look right now into your TimeMachine issue.

especially in 10.0.3 we made improvements to not fail backups to SMB shares on NAS devices, so here are some questions:

1) what type of NAS device are you using?

2) does the error persist if you turn off 'file scanning' and/or 'ransomware detection'?

3) does a backup succeed after you remove and then re-add the backup volume in the time machine preferences?

Frank

ESG - Mac Endpoint

Hi Frank,

For your information, I have

1) WD EX2 Ultra, f/w 5.09.115

2) I have turned off file scanning and ransomware and it works. I will send more info when the backup has finished (it's a bit big)

3) Did not have any effect.

Update - the backup starts, slows to crawl, then gets stuck on 'Calculation time remaining', Although it is still backing up at a ridiculously slow rate.

Ok, so it worked fine for a couple of days and now dead again since 22nd. 

Just turned off real time scanning for files & internet &All runtime protection, and it seems to be working.

Turn them bacon, and it fails.

thank you for performing these tests. at this time I have a few ideas what could cause the failure. form experience, SMB volume access can be disturbed by open file handles (for example our scanning process) and then abort current operation with "file in use" - I am thinking of a better detection and exclusion of time machine volumes shared via SMB. Could you also make sure that the "remote files" option is turned off (while real time scanning itself is enabled in your Threat Protection policy.

thank you for performing these tests. at this time I have a few ideas what could cause the failure. form experience, SMB volume access can be disturbed by open file handles (for example our scanning process) and then abort current operation with "file in use" - I am thinking of a better detection and exclusion of time machine volumes shared via SMB. Could you also make sure that the "remote files" option is turned off (while real time scanning itself is enabled in your Threat Protection policy.

Ok, so this does appear to work, thank you.

Interestingly, TimeMachine also works when the machine is sleeping.

Ok, this now appears to be working fine - incremental backups with no failures - thank you.

I tried this and unfortunately, it did not work

So, is this fixed in 10.0.4, or do I have to still leave this turned off?