Time Machine not backing up after macOS Sierra update

[maverick78]

Since upgrading to macOS Sierra my backup's haven't been working. It seems to be constantly 'Preparing Backup' for several hours. I have a late 2014 Macbook Pro 13". I've performed an SMC and PRAM (NVRAM) reset. I've also restarted my Time Capsule. Any suggestions or will I need to perform a clean install of macOS Sierra?

 

[maverick78]

Update: I've now tried to back up in safe mode and have had success! Not ideal but hopefully Apple will fix this issue with the next update.

 

[maverick78]

Further update. It transpires that it was my Sophos Antivirus that was causing the issue. I have temporarily disabled the anti-virus and now Time Machine is working without issue. Hopefully Sophos will update Sophos Home. Hope this helps you out if you're experiencing the same issues.

 

[nonimcc]

Further update. It transpires that it was my Sophos Antivirus that was causing the issue. I have temporarily disabled the anti-virus and now Time Machine is working without issue. Hopefully Sophos will update Sophos Home. Hope this helps you out if you're experiencing the same issues.

I don't have Sophos, I've tried restarting in safe mode, PRAM and trashing the in progress file and it just seems to be getting slower and slower. Help?

 

[LPariseau]

I have the same issue. I don't have sophos. I do use Avast. I can't figure out how to turn it off without uninstalling it!!