First Time Machine Backup to big need to make smaller

I am having some issues I could do with an opinion on. I ran time machine last night for the first time and it backed up my main HD(450GB used) and a secondary HD(450GB used) I am now very tight on space on my Time Machine Back Up HD (900GB used on a 1TB internal drive)
I shouldn't have had the secondary HD backed up I didn't set the preferences pane correct.
I want to do a new backup of Main HD tonight, what's the best procedure?
Reformat the Time Machine Back Up HD? and start again? or is there away to tell time machine to delete the secondary HD backup content? Or do I do what looks obvious and go into the Time Machined Back Up HD and just delete the secondary HD folder?
I have done some stupid things over the weekend with my install and this one I want get right!
Message was edited by: SpaceDesign911

Reformat the Time Machine Back Up HD? and start again? or is there away to tell time machine to delete the secondary HD backup content? Or do I do what looks obvious and go into the Time Machined Back Up HD and just delete the secondary HD folder?
Reformatting will let you start from scratch, but trashing may well achieve same objective (up to you I guess which you prefer). What you might want to look into in the future with Time Machine is to exclude elements (via options in TM prefs) from backups (e.g. other disk vols or applications) this will greatly reduce the size of TM backups created.

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