Why Did Time Machine Delete My Old Backups?!

[rekhyt]

I recently upgraded my hard drive from the stock Hitachi 250GB to a Western Digital 320GB. I restored from Time Machine.

I plugged in my hard drive today and left my hard drive to back up. Surprisingly, when I came back, the backups were being deleted.

Why?

It was the same installation. Now my unrecoverable backups are gone.

 

[S.B.G]

Anytime you restore from TM, it automatically deletes old backups and begins creating a new one. It's a design feature and it occurs when you change your OS X installation, i.e. when you put in a new HDD.

 

[Jolly Giant]

the backups were being deleted.

there is a chance they weren't - it's not what TM does.

Now my unrecoverable backups are gone.

maybe not. check out section E (especially E2) in this user tip.