File size in backup

When backing up to TC are the files just being copied in there original format or are they being made smaller? In other words is a 100 mb Quicktime movie file the same thing when its backed up on tc

No. Time Machine does not do compression. Compare the size of your data on your primary drive. Now compare that with the size of the backup file. It's about the SAME size if you have just started backups. But it is LARGER if you have been backing up for some time. This would not be the case if data was being compressed. See the Apple web site quote below:
*Anatomy of a Backup*
"For the initial backup, Time Machine copies the entire contents of the computer to your backup drive. It copies every file exactly (without compression), skipping caches and other files that aren’t required to restore your Mac to its original state. Following the initial backup, Time Machine makes only incremental backups — copying just the files that have changed since the previous backup. Time Machine creates links to any unchanged files, so when you travel back in time you see the entire contents of your Mac on a given day." [http://www.apple.com/macosx/features/timemachine.html]
Hopes this clarifies things.

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