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Problem backing up to Time Machine

Joined
May 7, 2010
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Location
UK
Your Mac's Specs
2 iMacsOSX10.15.5,10.13.6;2SEiPh/iPadMini13.5.1;iPad 12.4.7;iWatch1
My last successful backup to my external Time Machine hard drive was on 27 January. Message says:
'Time Machine couldn’t complete the backup to “Time Machine 1”'in bold followed by "Time Machine could not create a local snapshot to back up from".

I have tried deleting earlier backups to release disk space but to no avail. Should I delete the27 January backup and see what happens or remove all my backups and start over. Everyday backups go to my Time Capsule with backups to this drive about twice per month.
 
Joined
Jan 1, 2009
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Location
Winchester, VA
Your Mac's Specs
MBP 15" Mid 2015, iPhone 11 Pro, an iMac, plus ATVs, AWatch, MacMini
What version of the OS are you trying to back up? I have heard Catalina changes the way TM works, so maybe if you updated the OS and then connected this drive there was an issue with the change?
 
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