This is something which can be much more involved than it originally sounds.
Moving drives between locations is another task, where we are slaves to technology and work for the computer as opposed to having the computer work for us.
With a notebook that travels with me between home and work, as well as on trips - where I've been lucky enough to have drive failures. Clouds are nice, but I want something local.
My solution is to have two Time Machine backups - one at home on a larger drive for a deeper archive, and a smaller drive (2.5" usb) for work and travel. The problem with the smaller drive is the additional risk of theft or loss. The natural reaction would be encrypt the backup, but getting this to work in OS-X turned out to be not the most straight forward and simple of matters.
The following is based on OS-X 10.6.5
The steps are as follows:
1. Format the drive to be used for Time Machine
2. Find computer's info: Machine name and ethernet address
3. Create encrypted disk image on drive using disk utility or terminal
4. Add keys to keychain
5. Setup Time Machine
6. Peform backup, and hourly automated backups
7. Verify recovery capability
DETAILS:
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3. Make sure the disk image is located on the top level directory of the drive.
REFERENCES:
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