Old backup of a different OSX suddenly lost...!

I had a TM backups of different OSes (actually the same Mac, but after an OS reinstallation) on one ext.harddrive. While I was trying to acces the old OS backup (through option click>tm icon) the name of that folder (= the old computer name) sudenly changed to the the current computer name (= the name of the other folder = current OS backup) and after I reconnected the drive again, there only was the current OS backup.
In practice, that means – I had had two backup folders there: 1.) nameX (old OS) and 2.) nameY (current OS). Suddenly the nameX changed to nameY and so I had 2 duplicate folders of the same content there and after reconnecting the harddrive only one was present – that means the old backup is gone now...
How can I access/retrieve the now-invisible backup?
Thanks alot.
any help appreciated....
Jakub.

Provided you have not reformatted or deleted your old backup, you should be able to recover it, but you will essentially be turning your old backup into the new one. Pondini has created an excellent guide for this:
http://pondini.org/TM/B6.html

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Begin forwarded message:
From: Frances Topping <[email protected]>
Subject: Re: - Old computer I had is OSX Snow Leopard with Entourage. New one is OSX Mavericks. Using Mail where are my addresses and old address book. Transferred old computer backup by Time Machine and other things work? Can't see a symbol for address book.
Date: August 25, 2014 at 9:46:01 AM EDT
To: discussions-replies <[email protected]>
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Message was edited by: Matt Petruzzelli

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Old backup of a different OSX suddenly lost...!

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