Re-install Mac Pro (10.6.8) from Time Machine

I have a Mac Pro that has started to be slow and sometimes apps are crashing.
The issue might be the hard disk (even though Drive Genius reports the disk is fine).
I figure a re-install of the OS and apps would perhaps be a good thing to do.
However, will I benefit from erasing the system disk and have it re-installed using my Time Machine backup?
Or should I erase the disk, install 10.6, update the OS and then start putting back my apps and documents manually? (this is not what I really want to do....)

Read through these links, you might not be able to reinstall some 10.6 software if the developer is a arse and tries to force upgrade you to a slower/bloated OS X verison.
Why is my computer slow?
..Step by Step to fix your Mac
For Snow Leopard Speed Freaks
Also whatever problem your having, it could also be transfered to the TimeMachine drive, which you would just restore it back and have it again, if TM even bothers to restore. You can't easily verify if it will or not, just gambling basically.
IMO you should also make bootable clones, that way your options are open. Or cherry pick files off the clone drive if need be. TM restores are absolute, thus bringing good and bad back over again.
Most commonly used backup methods

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    Mail has gone crazy. Header's and messages are mixed up. New Mac Book Pro. Migrated files from Time machine running snow leopard. Reinstall or new computer needed?

    Ok; I'm not sure what you're doing.    36 hours is rather long.  Seems like a new migration.  Not what I intended.
    Here's what I intended: from the newly-migrated and apparently-corrupt environment, create a new user, not related to any existing user, nor any migration-created user, or any other user for that matter.  That is, use  > System Preferences > Users and Groups, authenticate yourself by clicking on the padlock, and then click the + and create a wholly new user.  Then log in under that user and establish the mail access.
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    Target Disk Mode is also sometimes an option for accessing the disk for a migration, but that requires the right cable, and requires systems that have the same external connection; newer MacBook Pro systems use Thunderbolt for this, and older systems tend to use FireWire.  And I'm guessing you don't have compatible hardware.
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  • Had hard drive renewed due to product recall (iMac) backed up complete system on time machine . Had the drive done got mac back tried to reinstall from time machine .The new drive tells me that the space has been taken up but can't find where the file hav

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  • HT201250 Time Machine backup then install new SSD HD + Pulling files from Time Machine from 'old' HD

    Hi Guys,
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    Hello,
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    If you have a second HD with nothing on it, why not do the fresh install on that, then use Setup Assistant to bring over all the files from the HD you've been backing up to TM rather than  TM itself? That way, you have the most direct transfer and a backup of the original too.

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    Hi,
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    RESULT :
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  • How to restore from Time Machine WITHOUT install discs using a second Mac

    It's a question that is asked repeatedly all over the web by Mac users like me that bought in to Time Machine (TM) on the assumption that if their computer died one day it would be a piece of cake to restore from it, only for that day to come and then to be told "ahh, okay the first thing is to get your computers install discs..." (loud crashing sound of world falling around ears).
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    *Link the two computers with a firewire.
    *If you're replacing your HDD, remove your corrupted hard drive from the 'broken' machine and insert a new one.
    *Power up the broken Mac whilst holding down the 'T' key. This will start it up in Target Mode and you'll get a nice firewire symbol floating around that machine's screen.
    *Power up the second 'healthy' Mac. This will be our 'donor' machine. When it starts up after a few seconds you will see the hard drive of the broken Mac appear on the donor Mac's desktop.
    *Using your donor Mac's 'Disc Utility', format the broken Mac's hard drive (now's the time to partition it etc. if you want to).
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    Your broken Mac is no longer broken and now needs a new OS. But you don't have the discs, right? Well get this... you can clone your donor mac on to your machine, even if they are totally different i.e. a laptop on to a tower.
    *Again using Disc Utility, click on your donor Mac's hard drive. The restore tab appears as an option.
    *Click on restore and drag the donor Mac's hard drive that contains the operating system in to the Source box.
    *Drag the newly formatted hard drive on the broken Mac in to the Destination box.
    *Click restore. Your donor Mac's hard drive will now be 'cloned' on to your no-longer-broken Mac. Once this is done, eject the first Mac's hard drive from your donor Mac's desktop. You no longer need the donor Mac.
    Ta daa! Your machine now starts up happy and smily again. Time to restore all that stuff that's been sat on your Time Machine drive...
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    This is the really clever part that prompted me to write this piece in the first place. Time Machine IS accessible without those Leopard install discs you don't have. You need to use something called 'Migration Assistant'.
    *Start up your machine as normal and you'll see it is an exact clone of the donor machine. Weird huh?
    *Attach your Time Machine hard drive. It will show up as an icon on the desktop and because of it's size, you'll be asked if you want to use it as a Time Machine backup. Err, NO YOU DON'T! Click 'cancel'.
    *Open Migration Assistant (if you can't find it just type it in to Finder and click). There are three options, the middle one being to restore from TM or another disc. Yup, you want that one.
    *Migration Assistant will now ask you what you want to restore in stages, firstly User Accounts, then folders, Apps etc. It will even import internet settings
    And that's you done. Let Migration Assistant do it's thang... altogether I had about 140gb to restore, so it wasn't exactly speedy. This wasn't helped by the fact that my TM hard drive is connected via USB (yes, I know). Just leave it alone and it'll whirr happily away...
    Before I go - you don't have an option of when to restore from, and will restore from the last Time Machine save. At least then you should be able to access TM and go 'backwards' if you need to.
    Also - for a Mac expert, the above will be up there with 'Spot Goes To The Farm' in terms of complexity. However, for the rest of us the above is only available in fragments all over the net. By far the most common response to 'how do I restore from Time Machine without install discs' is 'you can't'. If I'd found the above information in one place I could have saved a lot of hair pulling and swearing over the last couple of days, so forgive me for sharing this workaround with the rest of the world. Meanwhile your expertise will come in very handy for the inevitable questions that will get posted below, so please feel free to help those people that won't be sure if this solution is the right one for them. I'm no expert, I just want to help people that were stuck in the same situation (and looking at the web, there's a LOT of them).
    Hope this is of use to someone, thanks and *good luck*!

    Most maintenance and repair, restore and install procedures require the use
    of the correct OS X install DVD; be it an original machine-specific restore/install
    disc set or a later retail non-specific general install disc set.
    By having an unsupported system, perhaps installed via an illegal download or
    other file-sharing scheme, where no retail official discs are involved and the
    initial upgrade was done by other means outside of the License Agreements,
    you are asking us to discuss a matter of illegal installation and use of a product.
    There are no legal complete OS X system download upgrades online; only bits
    that are update segments to a retail or as-shipped machine's original OS X install.
    +{Or an installation where a previous owner had correct retail upgrade discs, &+
    +chose to not include them with the re-sale of the computer it was installed in.}+
    However, to answer the initial question. To get and use an externally enclosed
    hard drive in suitable boot-capable housing, and get a free-running Clone
    Utility (download online; often a donation-ware product, runs free) you can
    make a bootable backup of everything in your computer to an external HDD.
    This is the way to make a complete backup to restore all functions to the computer.
    The Time Machine has some limits, in that it can restore only that which it saves.
    It does not make a bootable clone of your entire computer system with apps and
    your files, to an external drive device. A clone can. And some of the clone utility's
    settings can also backup changes to an external drive's system; if that other drive
    is attached to the computer correctly.
    Carbon Copy Cloner, from Bombich Software; and also SuperDuper, another of
    the most known software names you can download and use to clone boot-capable
    system backups of your computer's hard disk drive contents, are often cited.
    However you resolve the matter of the running OS X system in your computer,
    derived from what appears to be questionable means, is part of the initial issue.
    Since you do need to be able to fix an existing installation by unmounting the
    computer's hard disk drive and run the computer from the other (install disc or
    system clone) while it is Unmounted; and use the correct Disk Utility version to
    help diagnose and perhaps be able to fix it. You can't use a Tiger version Disk
    Utility to fix a Leopard installation, and so on.
    So, the situation and replies as far as they can go (since the matter does
    constitute an illegal system, if it was arrived at without correct discs) is a
    limited one. And file sharing of copied Mac OS X (and other) software is
    also considered illegal.
    And, one way to get odd malware and unusual stuff, is to get an unauthorized
    system upgrade from an illegal source online. You never know what's inside it.
    The other reply was not a personal attack; the matter is of legal status and as
    you have a product with a questionable system, the answer is to correct it.
    And if you want to save everything in your computer, make a clone to a suitable
    externally enclosed self-powered boot capable hard disk drive. With older PPC
    Macs, that would best be to one with FireWire and the Oxford-type control chips.
    However that works out...
    Good luck & happy computing!

  • Mac Pro doesn't boot from any media

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