Time machine backup with external boot drive

Swm1982

macrumors newbie
Original poster
Jun 2, 2013
4
0
Hi all,

I use an external SSD via thunderbolt to boot my 2011 imac, I use this drive for the OS / apps and some files and folders, but my internal HDD is my main storage drive. I can still boot from my internal HDD if I need to.

My question is, how will time machine work with this setup? Will it only back up my internal drive, or will i need to make 2 backups? Can't get my head around this one!

Thanks
 

Dirtyharry50

macrumors 68000
May 17, 2012
1,769
182
I imagine Time Machine machine won't allow you to specify the drive you booted from as the drive to back up to but maybe I'm wrong. It's not like I ever tried it.

My concern in your case would be that Apple recommends that Time Machine backups be on a single partition disk that is dedicated to them. I got this from Apple support on more than one occasion when I was having issues with Time Machine that were in my case later resolved by switching to a different brand of disk and following their advice: one partition and nothing but Time Machine backups on that disc.

They do not make this plain as I recall when you consult Time Machine's help system or look for info online and I was critical of that when I spoke to Apple support but they maintained it is not a good idea to do anything other than what they recommended.

So, you might want to keep that in mind if you run into any problems.
 

Fishrrman

macrumors P6
Feb 20, 2009
17,663
5,777
Suggestion:

Switch from Time Machine to CarbonCopyCloner (or SuperDuper).

You will then have full control over the "source" and "target" drives for your backups.

You will also be able to create a fully bootable backup, as well (can't do that with T.M.).
 

Swm1982

macrumors newbie
Original poster
Jun 2, 2013
4
0
Nice one, thanks for the replies.


I used CCC when I got the SSD, I'll give that a go. Do you think it will be ok to partition and use the same drive to back up the internal and external? (using CCC instead of time machine)
 

ZMacintosh

macrumors 65816
Nov 13, 2008
1,208
297
easy under the time machine preferences under options make sure your SSD external is not on the excluded list and it will back up to your time machine drive easily.
 

FreakinEurekan

macrumors 68040
Sep 8, 2011
3,395
333
Eureka Springs, Arkansas
easy under the time machine preferences under options make sure your SSD external is not on the excluded list and it will back up to your time machine drive easily.
Yep TM won't care which drive you boot from and it'll backup both drives, assuming you have a 3rd drive (or a Time Capsule) that you're backing everything up to.

I have an internal Fusion drive and an external array, and all of that is backed up by TM to a large disk in an external SATA dock.