Using Time Machine (Catalina) Backup Drive for Big Sur
I have recently bought Mac Mini with Big Sur and everything went very well in setting it up. Because my previous IMAC (2013) had undiagnosed failure it could not be used for Migration Assistant or Target Disk. So I used the Catalina Time Machine back ups held on a Western Digital 2 TB HDD. It installed well and as far as I can see everything required is all available and working correctly. So now I want to start using that HDD with the Mac Mini Big Sur. My preference would be to just start to have TM backups going to the HDD whilst retaining the existing Catalina back ups. I tend to be cautious.
Is this feasible or should I totally reformat the HDD for Big Sur back ups to TM?
Mac mini, macOS 11.1