Apple - Support - Discussions - How to make a back up copy of system ...

There is a way but it's complicated.

1.) Get an 8GB USB stick and format it for a boot disk (partition it with GUID option and (Mac OS X extended (journaled)).
2.) Insert the Apple USB stick also. There is a invisible file at the root you need to mount on the desktop called MacOSX.dmg. You can use a utility such as Onyx or use the terminal with the open command to mount it.
3.) Use carbon copy cloner to clone the mounted "Mac OS X Installer Image" to the new USB stick
4.) Unmount the "Mac OS X Installer Image"
5.) Use carbon copy cloner to then clone the Apple USB stick to the new USB stick. Select the delete exiting files. Steps 2 - 4 are necessary because if you just clone the Apple USB stick the new USB stick won't be bootable.
6.) After this finishes you will now have a bootable copy. You can then also use Disk Utility to create a disk image of the new copy.

I've done the above and it does work.

如何備份 MacBook Air 所附的 USB 還原 stick。

Slow Tracking speeds for the new Magic Mouse | MacFixIt - CNET Reviews

Great tip. Should add that you need to set the System Preference Tracking Speed to Minimum, then execute the scale command and then slide the Tracking speed up to Max. I used:

defaults write -g com.apple.mouse.scaling 10

and it's finally at an acceptable speed.

codepocket.com

1. 先將滑鼠速度調到最低
2. 執行 defaults write -g .... (最大就是 10 了)
3. 再將滑鼠速度調到最高

速度似乎就正常了。(適用所有滑鼠)