How much space do I need for back up when I upgrade?

Hi All,
I'm going to upgrade to 10.8 from 10.6.8.
I have never used time machine before, but am planning to do so now to back up before upgrading.
My disc is around 600GB in total.
If all goes fine, after a few days I plan to back up again with the new osx, continue from that point making regular back ups in 10.8.
Question: Do these new back ups in 10.8 start from scratch as its a new OS, or will Time Machine just add the changes to the first one I did, like it would normally do.
The reason I ask is that I'll have no need for the 10.6.8 back up once all is installed and working fine and backed up in 10.8.  So if its a fully new back up, then I'd like to delete the inital one so I'm not using 500gb of space twice.
Thanks for your help.
Richard

If you perform an upgrade to Mountain Lion, Time Machine will carry on using the backup you started with Snow Leopard, so it will continue making incremental backups. Also, it will keep your Snow Leopard backups

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