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Message: <blockquote data-quote="MacInWin" data-source="post: 1717334">Welcome to the forum. What I would recommend is that instead of using TM you use a cloner to accomplish both tasks. That way the backup could be bootable in case the internal drive fails, so you can get going again quickly.  I would also say that for your use, I would partition the external into two partitions, one for the Mac backups and one for the External clone. That way you don't have to worry about the possibility of one overwriting the other as much. (It's still something to be careful with, but not as perilous as trying to have both on one partition.) As for the partition sizes, I'd say keep them about equal and then backup the entire internal drive, not just the data. That way the backup will be bootable. IF you don't expect the 75GB of data on the internal to grow much, you can set the Internal backup partition a bit smaller, but don't make it too small or you'll run out of space pretty quickly. Now, for software either Carbon copy Cloner or Super Duper will do what you want. I use CCC, but either one is just fine. Set up CCC to clone your backup to the first partition on the external and to keep changed files. CCC calls it "Safety Net." You can set it to either run on a a schedule and leave the backup drive attached, or just run it when you remember to do so and attach the drive. Then do the same for the External Photography HD to the other partition. If you use the "run when I say run" approach, I'd suggest you put a reminder on your calendar to nag you to do it. Backups are easy to forget, until you need it.Now, for TM, how it works and setup is here: <a href="https://support.apple.com/en-us/HT201250" target="_blank">https://support.apple.com/en-us/HT201250</a>One thing to remember is TM backups are NOT bootable, even if you set them to back up everything. Clones should be bootable, as long as you let them. Hope that helps some.</blockquote>

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