Backing up with cp - files are missed

I have an external hard drive mounted at ~/video, which holds videos as well as backups of the internal drive. I've copied everything to it and then have been using this to update the backup:

Code:

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sudo cp --preserve=all --update --recursive --verbose ~/*?[!video] ~/video/.backup/home/hyperhacker/

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For some reason this is not copying all updated files. :?

I'd like to switch to backing things up to a compressed archive, as well. What format would be good for this? 7zip doesn't preserve some attributes from the filesystem, and if I use a .tar.gz I'd have to recompress the entire .tar every time.

rsync is intended for smart copy.