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Back That Mac Up: Set Up Time Machine and Stop Worrying About Data Backups

Here's how to automatically or manually back up your data, and then restore it on your Mac using Apple's Time Machine feature.
Ars Technica

Why is TIme Machine not doing a complete backup?

I'm trying to create a TM backup to restore from. Even though it is a completely new drive and TM is set to defaults, it is only backing up 1/2 the data. The drive is 50GB full. TM is backing up only ...
Ars Technica

How big does a Time Machine drive need to be as a % of the data drive?

I have an iMac 2.8 GHz i7 with 16 GB RAM running 10.8.2 (12C54) I have a hard-drive connected via FW800 and have allocated 1.2 TB for use by Time Machine. What is going on? How can I solve this? How ...