[MlMt] MailMate and Time Machine

Glenn Parker glenn.parker at comcast.net
Thu Oct 22 12:22:57 EDT 2020

I came across this low-level approach to debugging Time Machine 
performance issues:


> I left for last the most complex, low-level debugging tool you have 
> available allowing you to monitor your filesystem access in real-time. 
> This is a powerful tool allowing to investigate what is the actual 
> root cause of Time Machine’s delay. In particular when you face long 
> delays waiting for “Preparing backup” this kind of investigation 
> can shed light to otherwise mysterious delays.
> Open a Terminal and issue the following command:
> sudo fs_usage -w | grep -i backupd | grep -i fsctl
> Upon entering your user-credentials you will start seeing many, many 
> files appearing in your terminal window. These are the files that Time 
> Machine is checking for changes. By carefully observing the patterns 
> and folders being accessed, you can identify folders which may have 
> thousands (or even, tens of thousands) of small files that you don’t 
> need to backup and by excluding them you can considerably speed up 
> your backup times.

I verified that this works and it seems safe enough even for those less 
familiar with command-line utilities (but just in case, you halt this 
tool with Ctrl-C).

Glenn P. Parker
glenn.parker at comcast.net
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