How to continue use Time Machine backup after migration?

Hi,
I just purchased a new mac and migrated using my Time Machine backup from my NAS.
This went smooth but now I would like to keep this backup as base for my new mac.  Unfortunately, this does not seem to work as my mac tries now to create a new image.
As I have pretty important documents on my previous backup, it would be nice if there would still be a way to continue using this one.  I saw somewhere that the migration assistant should ask if we want to continue based on this backup after migration but I did not receive this question.
Is there still a way to solve this?
Thanks in advance for your input!
Kind regards,
Fred

Hi Leonie,
Thanks for your link!  I am migrating from Leopard to Mavericks.  If I understand correctly, this is the reason why I cannot inherit from previous backup.
The procudure to tweak seems pretty complicated though... not sure I will risk it.
Thanks anyway!
KR,
Fred

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