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kswaty 02-14-2006 11:33 AM

Mac and Backup newbie, sizing sandbox and sparce image
I have just ordered a second internal hard drive (250 gb) for my DC PM G5 and am about to order SD. I have read the SD manual at least 7 times and am developing a strategy for a Sand box and a plan is to use the new drive (since it is faster) for daily use booting into Sandbox and the original drive for backup. Whether or not I duplicate my apps in Sandbox (many 3rd party) will be determined by the speed of sharing applications between partitions - such as does it slow down Photoshop CS to share the app...?

Also since user data is shared, I'm thinking the partition for Sandbox could be smaller than the one for original HD - how do I determine this size.

I am also wondering how to determine the size of a sparce image, which I am assuming is the same as a disk image. If my system - apps and data is 100 gb - what size will that sp image be?

After updating my OS in Sandbox and determining that it works properly, I then apply the update to the original seperately or by verrry carefully writing over the original with Sandbox - correct? ...and when I want to update my backup internal dr, I then clone it from the original partition I am using with Sandbox...which will clone the updated OS...correct?

I understand that any files that I delete from the Sandbox will also be deleted when I update the Backup drive. I thought one way I could deal with this is to create an Archive-Deleted files folder for priority archive files on the backup drive and put a copy on the original on the Sandbox drive right before I update it so they will be put back.

I am looking forward to using SD and updating to 10.4.4!!!

dnanian 02-14-2006 12:32 PM

Sharing applications doesn't make them slower, since it just links to the original application, on the original drive.

The easiest way of determining the size of a Sandbox is to create one on a blank partition, before you partition for real. Check the size, give it at least 20% slack plus space to grow. We usually recommend 8-12GB or so.

If you're going to use a Sparse Image, we size it automatically, with its maximum being the size of the drive.

You're right w/Sandbox updating the original. Just follow the steps in the User's Guide.

Finally, remember that user files on the Sandbox are really on the original drive, so deleting files when booted from the Sandbox are really deleting them from the original. Also, remember that there's no need to back up the Sandbox; always back up the original volume.

kswaty 02-14-2006 01:13 PM

Thank You Dave - It sounds like if I make my Sandbox partition about 40 to 50 gb, I will have plenty of room to include applications if I want - although I like your tip about putting new installations on the desktop - in this situation, you would install the new app while in the Sandbox, put it on the desktop to share with the original, then when you're happy with it, move it to the applcation folder [do you reinstall it in the original or copy it].

About sparce image - if I was going to create a partition to store one, I was just wondering if the partition would have to be gb per gb, exactly the same size as the original. My husband say that in the PC world that is called Ghosting, and that the Ghost disk image is much smaller than the original.

dnanian 02-14-2006 01:18 PM

Well, 40-50GB might be overdoing it a bit, but the extras space won't hurt.

A sparse image will only "grow" to store the data inside it, plus space for overhead. It's not compressed, but the "sparse" part means that the free space isn't in there...

kswaty 02-14-2006 01:51 PM

Good explanation of "sparce" image space - thank u - looks like SD is exactly what I need right now!!!!

dnanian 02-14-2006 01:52 PM

Glad to hear it!

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