Here's a tip, if you use .Mac with a locally-cached iDisk.There are two problems with Time Machine and iDisk. First, while the iDisk .dmg file is backed up, you have no access to any folders within your iDisk through Time Machine. This is kind of unfortunate, as I keep my all my personal documents on an iDisk (locally cached at both ends) to keep my iMac and Macbook in sync.Second, every time you make the slightest little change to your locally-cached iDisk, Time Machine has to copy the entire disk image again. The same would apply to disk images for virtual machines, for instance. In addition to making your hourly backup more time-consuming, this will quickly eat up free space on your backup disk. Since Time Machine for iDisk is already pretty useless, just exclude the local DMG of your iDisk from Time Machine backups. After all, all the files on it are already ...

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