Time Machine erased previous back up .... aaargh

[yukra]

Hi, i'v just lost important files when my new backup on an external HD using Time Machine deleted and wrote over a previous one ... informing me after (!) deleting (and why not before???). Is there any means for me to recover these files : mainly pics and music?? Thanks for your help!

 

[BlueRevolution]

Time Machine wrote over a previous backup? What do you mean?