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I have just tried to do a time machine backup but it failed with a message saying I have two drives with the same name.
Anyone have a fix for this?

Open Disk Utility and rename one of your drives
 
Not having that problem but strange behavior from TM - it, as always counts 50 out of 300mb but then when it gets to 300 - it keeps backing up - gets to 320MB for instance but not with the out of - then stops and finishes and cleans up.
Seems to work fine but again it keeps backing up after it gets to the out of.
 
I thought you could just open Time Machine on your Mac, select Open Time Machine Preferences and untick the box for Back Up Automatically.

Has anyone figured out how to disable local backups in 10.15? The terminal command no longer works.
 
I thought you could just open Time Machine on your Mac, select Open Time Machine Preferences and untick the box for Back Up Automatically.

That only pertains to when a drive is connected. Time Machine has also done periodic backups to the SSD since Lion.
 
It's possible that you may have 2 Macintosh HD - Data volumes if you've re-installed at any time without deleting the first one. I know I did :)
This is probably why you get that message.
The problem is knowing which one to delete. I had one that was not "attached" to a system drive so I deleted that one first. Sadly that led to some losses on my system so I ended up deleting the other and re-installing.
After that TM worked fine.
 
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