Offsite Backup with OS X Raid/Mountain Lion

No, I would not do this.
It should be no problem replacing a raid member with a new empty disk, but what happends when you get your old raid member with the current one?
Or are you going to format the old drive every time?

Raids are not for backups.

Buy two USB drives and use time machine. Now with ML you can use two different drives without problem.
This way you get a proper backup with history as well.

It sounds like you're talking about bringing the offsite disk and just popping it into your machine and hoping the RAID pair will rebuild from that disk, rather than the one already in the machine?


It seems a messy way to do things and I'm not sure AppleRAID will rebuild the array unless one of the disks is wiped; as a backup solution this would mean you'd actually have less redundancy while you're rebuilding the set. I dunno how G-Safe worked but it was likely a bit more sophisticated with some kind of merge/sync functionality.

Sounds to me like rsync might provide something like what you're after. You just need to create a script or AppleScript app with an rsync call inside, and use this to sync the portable drive with the local drive on any machine you connect it to. Then do the reverse when you're ready to take it somewhere else.

This way the portable drive always has the latest copy of everything, but your machines still have a copy just in case.

kave said:

Buy two USB drives and use time machine. Now with ML you can use two different drives without problem.
This way you get a proper backup with history as well.

Click to expand...

I do essentially this but use Carbon Copy Cloner to back up to my offsite USB drive. Do you see any advantage to using Time Machine over CCC?

Aragornii said:

I do essentially this but use Carbon Copy Cloner to back up to my offsite USB drive. Do you see any advantage to using Time Machine over CCC?

Click to expand...

Yes, the difference is that go also get history in your backups. Let's say you corrupt a file today, you make the sync to drive1 this evening.
Next week you sync to drive2.
The week after you liked to use the file, but it will be corrupt on all three drives since you won't have history.

Time machine will give you a version from every change you make. So you can go back in time and say I need this file as it was 2.5 weeks ago or whatever.

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DHKaplan said:

Hi Kave,

I really don't understand your reply. What do you mean by:


David

Click to expand...

Well, what I mean is that you have three drives, driveA and DriveB and driveC.
Lets say DriveA is always connected. You alternate drive B and driveC.
When you replace driveB with DriveC the second time you will have different data on DriveA and DriveC. How would the raid system know which is the one you like to use?
I don't even think you can do this, but why don't you try?