Setting up but not enough space on external drive, it says

I want to back up work files rather than the whole of my hard disc. In Time Machine preferences, I've indicated for it not to back up (library, system files, applications) which leaves a total of 64.2gb to fit onto a 80gb drive. When the process starts, it tells me there's 76gb to transfer onto a drive with a capacity of 74gb.
Do I need to knock out more files from what needs to be copied or get a bigger drive or have i indicated vital files not to be copied that need to.
Thanks
BB

Your 80GB drive is actually not 80GB as far as OS X is concerned. This has to do with how 1GB/1MB/1kB/1byte is defined. See for instance here:
http://en.wikipedia.org/wiki/Gigabyte
Note that TM normally requires 2 or even 2,5 times the size of the data to be backed up for the initial backup.
As for files not needed to be included, see for instance here:
http://www.ryanblock.com/2008/05/good-folders-to-exclude-from-time-machine-backu ps/
Plus search these fora.
/p

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