ADVANCED: Is manually editing a SparseBundle partition the best approach for backing up 2 Macs to 1 Time Capsule?

Problem/Question: I want to back up 2 macs to 1 Time Capsule, AND provide each of them with an equal amount of space.
Issues:
— to ensure one doesnt "out backup the other" - AND since it isnt possible (practically) to Partition the HDD within the Time Capsule
or in other words: to prevent 1 computer from taking more space for itself by providing an equal amount of backup space to each computer)
*Without manually removing the HDD inside the Time Capsule, docking it and partitioning it in DiskUtility and then remounting it into the Time Capsule...
I understand that it is possible to restrict the size of the SparseBundles, so in theory, one could make at 2TB Time Capsule have a 1TB a sparsebundle for EACH computer, and thus would leave each computer with a maxium 1TB each of backup space.
Following Pondini's instuctions for SparseBundle editing here:
http://pondini.org/TM/A8.html
Is this reccomendable? Any issues I would encounter? or other suggestions for how to proceed?
Thanks
—James
PS - Manditory complaining moment: Why can't Apple just enable a Partioning option in AirPort Utility so we dont have to worry about this?!

The disk space is not adequate for the operation.. archive off the existing backup if you need it.. then start a new backup from each computer.. once you have a new clean backup then set one to 1TB (remember a 2TB only formats to 1.8TB though, so you really should set one sparsebundle to 800GB.. and leave the other one to fill the remaining space.. the disk must have 10-25% free space remaining for backups to work.
Note what Pondini says..
It may not "stick" on Snow Leopard 10.6.3 and 10.6.4, and on some occasions, Mountain Lion.
This is not a 100% solution.. Even on ML it did not work reliably.. and if that is the case you can almost predict Mavericks will be worse... before it gets better.
James died before Mavericks came out so unfortunately we have no more information.. but Mavericks and how it handles sparsebundles could well be different.

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ADVANCED: Is manually editing a SparseBundle partition the best approach for backing up 2 Macs to 1 Time Capsule?

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