we are missing big files/folders under a dfs tree. Is there a way to find out what happened and where the files/folders went ?

Hi JonDoe,

Thanks for your post.

May I ask do you mean your sysvol files or just the files under dfs server?

Could you please also check if there's error in the event log? And offer more information about your issue?

If you mean the sysvol files, you could check the articles below.

Troubleshooting missing SYSVOL and NETLOGON shares on Windows domain controllers

https://support.microsoft.com/en-us/kb/257338

How to rebuild the SYSVOL tree and its content in a domain

https://support.microsoft.com/en-us/kb/315457

If it's just under dfs server, you may could also monitor the DFSR log file to find the exact replication process and find if there's some error.

Best Regards,

Mary Dong