Back ups disappeared. I can see the folder structure but they are all targetless alias.

Hi,
A couple of months ago I restored a Lion MacBook Time Machine Back up to a new MacBook Air using Mountain Lion. Obviously, the whole content wouldn't fit in the considerably smaller hard drive of the MBA, so I only downloaded what was most important, and left the back up in my external disk to access if I needed other files.
The thing is, I did access the files a couple of times, but sometime in the past two months the back ups have dissapeared. Instead, I can find my fold structure, but they are only aliases. There are no files there.
I used finder to browse through all the different dates inside the Time Machine folder, but there were still only aliases.
The Time Machine Back up folder reduced in size from about 500GB to 45GB, but I have not deleted anything. And I haven't set up a new time machine.
Any one has any idea of what might have happened?
Thanks in advance.

Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Repair Database. If that doesn't help, then try again, this time using Rebuild Database.
If that fails:
Option 2
Download iPhoto Library Manager and use its rebuild function. (In Library Manager it's the FIle -> Rebuild command)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one. 
Regards
TD 

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