Moving already backed-up data to different drive

Hi all -
I have about 700gb of videos that I want to move off my iMac's internal hard drive onto an external drive. The videos have already been backed up with Time Machine.
After I move the videos to the external drive, I want to continue backups on that data, but don't want to create a duplicate backup of the data that's already there. What's the best way to do this? I'd prefer not deleting the backups so I can keep the history, but not sure I can avoid that.
The only thing I can think of is to move the videos to the external drive, then create a link from the original location to the new location on the external drive so the original directory structure is intact. Will Time Machine see that as being in a new location and still do a full backup when it first sees it?
Thanks!

Thanks, klaus1! I looked briefly at the SyncTwoFolders link you posted, and it definitely sounds like something I could use.
A couple follow-ups just to make sure I'm following correctly:
- would SyncTwoFolders be needed only for the initial duplication, or would I need to keep using it? If the former, what's the difference between doing this and doing a straight copy?
- would I set my internal drive "videos" folder as the source, and the external drive "videos" folder as the target? And would that then trigger SyncTwoFolders to start copying the files to the external drive?
- after the above, I should now have two identical "videos" folders, right? I don't think I need to do the aliasing as these videos are my raw AVCHD videos that aren't referenced anywhere, and I can't play or do anything with them except to be imported into iMovie. So when I delete the originals, the target copy (on the external drive) becomes my only copy.
- when I then start Time Machine backups on the external drive, does it know not to back those videos up? And when I add new videos, those will backed up by Time Machine as usual?
Thanks very much for your help!

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