HT201250 My macbook pro crashed and I had to install a new hard drive. I restored from Time Machine backup all the files from my old hard drive onto my new one.

Does it really back up the whole new drive or does it only back up what's been added? It seemed like it was doing the whole thing when I tried it. I stopped it. Don't want to use up all the space on my external. Is there something else I need to do or did I mess up by not doing the migrating thing? thanks!

If you installed a new hard drive, it has nothing on it and yes TimeMachine is going to take forever to restore everything back.
I guess you'll have to erase and start over again now.
Too bad, you should have made bootable clones in addition to TimeMachine, they can restore in a hour or two depending upon content, they are also option key bootable.
TimeMachine has to go through and calculate all the files it needs to bring forward, the files are strewn all over the drive. The read heads are moving all over the platters all the time from fast sectors to slow ones, not matching what's occuring on the internal drive.
With a clone the files are defragmented and optimized, the drive reads one file, moves the heads a tiny bit and reads the next all the while transferring exactly to the internal drive, they are more in step with one another, thus it's much faster restoring from a clone than TM.
Most commonly used backup methods

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