Problem backing up to Time Machine

Joined
May 7, 2010
Messages
981
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14
Points
18
Location
UK
Your Mac's Specs
2 iMacsOSX13.6.4;10.13.6;iPhone SE2 17.3.1;SE1 15.8;iPadMini15.8;iPadAir 2 15.8
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
Messages
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Location
Winchester, VA
Your Mac's Specs
MBP 16" 2023 (M3 Pro), iPhone 15 Pro, plus ATVs, AWatch, MacMinis (multiple)
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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