Backup is taking up over 30gb of storage on my macbook air, what can I do about this?

...and that is actually the largest thing on there...why so big? is this normal? shouldn't my backup all be with time machine on the external hard drive?
I have a macbook air, 128g (i think)
Thanks in advance for any help!
Emma

OS X Lion and later make local snaphsots on your flash storage if Time Machine is enabled. Nothing to worry about.
They will be removed when your drive is getting full, so there's no reason to be worried. Anyway, if you want to remove them, open System Preferences > Time Machine, and turn it off. Then, turn it on again

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