Hi all, I'm running OSX Mavericks. I've got 2 external USB drives. I want to back them up, but each one has different files. How can I back them up without losing any files? I want to make one of them the main drive and the other one I want to make the 'back up' drive. Are there any tools I can use to do this? This is another way to describe my situation: I have two disks, disk 1 and disk 2. on disk 1 I have a bunch of files....say files a,b,c,z on disk 2 I have a bunch of files....say files a,q,r,z I want to merge disk 1 and disk 2 onto a single disk, say disk 1. Disk 1 will then have a single copy of a,b,c,q,r,z Also, I'm using Time Machine and it's been great. However, I only have one Mac so if the Mac dies I won't be able to access the Time Machine backup. Is there an App I can use to copy files from my Mac Mini internal HDD to the external drive? I want it to be done automatically without me needing to use the copy and the paste function. Thanks!