Why do I have 2 sets of Library Files?

Hi All,
I have a Macbook Pro which I upgraded to Lion in October last year.
I've noticed that the HD (250GB) is almost always full. I have a 1TB volume Time Machine that I keep a lot of old stuff on. I've been looking to see why the disk is full and I see that applications and Library files take up about 27GB and 40GB respectively. Music takes 45GB and Pictures 2GB. By my humble maths, that makes around 115GB and I can't for the life of me see where the remaining 135GB is being used up by.
What I vae noticed is that there seems to be two sets of Library files. There's one that came with the machine but there seems to be another one that appeared when I upgraded to Lion. Is this right that there should be two sets of Library files? I've had a quick look and they seem to contain identical files. Can I delete one of these? sets? If so, which one should I delete? One resides directly on the Macintosh HD and the other is under HD/System/
Any help would be appreciated.
Thanks in ad

Mrben1969 wrote:
there seems to be two sets of Library files.
You should have three different folders named "Library". They are
<~/Library>, or the Library folder in your Home folder (aka, Library folder from user domain)
</Library>, or the Library folder at the root level of your startup disk (aka, Library folder from local domain)
</System/Library>, or the Library folder in the System folder (aka, Library folder from system domain)
And under no circumstances should you even dream of deleting any one of them.
Should this dream ever occur, you need to get cured by reading a basic book about Macs, eg, David Pogue's "Missing Manual…".

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