Hard drive full, what to do?

I have a Mac Mini(i think late 2009), and have completely filled it's 300GB hard drive.  I have done a complete back-up to TC.  So my question is now about the data on my MM.  If i delete files on my hard drive, say like some video files in iphoto, to make room on my MM drive and I fill it up with new video files, when time machine does its daily backup to TC, will it erase the files on TC that i erased on my MM?

Gary,
I was thinking of using my TC as my external hard drive.  Since I have been using Time Machine to do my daily backups to the Time Capsule, my current hard drive memory should already be there, right?  I was then going to turn off the Time Machine daily backup, wipe my hard drive on the MM and I should be good to go.  As a secondary precaution, I was going to get a cloud service to back up my Time Capsule as a secondary fail-safe before I wipe the MM.  Plausible or crazy?
Thanks,Lee

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