Create a backups.backupdb folder on a non Time Machine drive
 

Hello,

sorry for nagging again with this TM questions, but before losing an 8hr backup of a 1TB drive I'd like to know a "backups.backupdb" folder in a non-TM assigned drive will preserve its own content during an SD! backup on the same partition.

Hope it's possible...

I'm not sure I understand -- preserve 'its own content'? We will always preserve a folder named "Backups.backupdb", regardless of whether Time Machine is actively backing up on that drive, assuming you're using "Smart Update" and there's no folder on the source named "Backups.backupdb".

The "What's going to happen?" section of the UI will tell you what'll happen...