How to limiting the size of an existing Sparse Bundle for Time Machine?

There seems to be a solution for locking the size of a new sparse bundle to be used for Time Machine backups (see https://discussions.apple.com/thread/2383738?tstart=0). However, I have a Time Machine sparse bundle with a year's worth of history that is getting very large and I would like to limit its size. Is there a way to constrain the size of an existing sparse bundle without trashing it.
Appying the suggested techniques"
hdiutil resize -size 300g xyz.sparsebundle
and
SetFile -a L PATHTOSPARSEBUNDLE/Info.*
on an existing sparse bundle somehow corrupts it and TM wants to start from scratch.
A method for constraining the size of a TM sparse bundle without trashing it would be very appreciated.

budden10, please try this:
Disconnect the external drive to simulate it not working or having failed
Open Time Machine on your Mac and wait a few minutes for your backups to load fully
Go back in time and select a date when you were backing up the external drive
Now look at the Finder window and locate your Mac on the left side of the window under DEVICES
Click on your Mac
What do you see in the window there just to the right?

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Message was edited by: b j t

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Time Machine is a backup of your computer SYSTEM, not idealized as a data archive.
Consider other options for the future >
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How to limiting the size of an existing Sparse Bundle for Time Machine?

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