time machine wouldn't backup after restoration from time machine?

[tongteh]

Alright, i just got my macbook fixed, the service people changed my macbook's harddisc, but now i can't complete a time machine backup anymore.. anyone have any idea? thanks..

 

[Richard1028]

Is TM turned on?

Open up TM preferences. Check the settings and make sure the proper drive is designated as the TM drive.

 

[tongteh]

it is.. i just found out the error message.. its saying i dont have enough space on my harddrive.. but how come? since i restore it from time machine backup, why does it want to do a full 160Gb backup again?