New OSX and Time machine question

Soldato
Joined
18 Feb 2007
Posts
13,123
Location
London
Hi

When the new mac OS X sierra is released, Im thinking about doing a clean install possibly, due to a few problems on el cap.

I have a connected external hdd used for TM backup.

When I do the clean install and everything is fine should I format the TM backup and start a fresh.

Im just wondering if old TM backups of el cap will be ok still on the hdd or if a new mac OS X requires a clean hdd?

Thanks
 
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