I’ve got  a WD drive I’m using for Time Machine. I had to halt TM  before doing 
an erase and reformat. TM  uses fseventsd so that might be what you see. Anyway 
with TM not running Disk Utility happily reformatted the WD drive as APFS. 

I can confirm that with APFS TM runs much faster than with HFS+

Regards,

Tony
Sent from my iPad

> On 16 Nov 2020, at 22:33, itsagroup via Sussex Mac User Group 
> <[email protected]> wrote:
> 
> Hello all,
> 
> Big Sur allows Time Machine to backup to an APFS formatted drive. Apart from 
> just being a modern and robust filing system, it’s much faster to perform TM 
> backups than HFS+ according to what I’ve seen. I planned to reformat my WD 
> Passport drive using Disk Utility for speed and reliability improvements.
> 
> The problem is that the format fails because fseventsd is using the drive. I 
> could kill it in Activity Monitor I suppose but I don’t know if that’s wise …
> 
> Any thoughts, or should I just carry on using HFS+?
> 
> I’ve downloaded the latest WD Utility app which has an erase option but it 
> still only offers HFS+J.
> 
> Cheers,
> 
> Stephen
> 
> 
> 
> "My nephew asked me what a Conservative is, so I stole half his toys and gave 
> them to the rich family next door." ~ unknown
> 
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