Why so much space used by back-up?

I am trying to get rid of useless things on my macbook and it says that I have 24 GB of space used by back-ups. What exactly is this used for and is it necessary? I can't figure out what it is backing up and where it is stored on my hard drive.

Sounds like "Local Snapshots" to me.
Have a read here:
Mac OS X 10.7 Help: About local snapshots
OS X Lion: About Time Machine's "local snapshots" on portable Macs
http://web.me.com/pondini/Time_Machine/30.html
The Local Snapshots get deleted over the time or if the diskspace is needed.
It's an automatic procedure.
Stefan

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    You can watch it here but I wouldn't recommend it :)
    http://www.sqlpass.org/sqlrally/2013/nordic/Agenda/VideoRecordings.aspx
    MCM - SQL Server 2008
    MCSE - SQL Server 2012
    db Berater GmbH
    SQL Server Blog (german only)

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