Mirroring systems

Hello.
Is it possible to have a system mirrored in real time, like a time machine backup but onto another physical system? The reason I ask is I have a major install to do, with one system which is the master. It's fully backed up, but if it dies in any way the format and reinstall will cause delays I can't work into the schedule. I'm wondering if I can have a second system be an exact dupe of the first in every way, so if anything bad happens the second machine can take over whilst somebody repairs the first.
I'm using mac mins with Snow Leopard. The reason for no built in screw up time is not down to me

Hi emptythetill;
One thing to keep in mind about any kind of real time mirroring, RAID included, Is that if something happens to corrupt the data the real time mirror will reflect that corruption. As an example let us say that you have an application which has a dozen files open. The application crashes taking all dozen files with it as it dies. Your real time mirror would also lose the files because it is being kept in sync with the other disk in real time.
Generally rather then going for real time mirroring, they tend to use short cycle backups instead. You decide what is the smallest window of work you can safely lose. If that is a week, a day, a shift or an hour, you then set your backup schedule to do another backup in that time interval.
If data is lost for which you don't want mirrored, then you have the opportunity to shutdown the backup before the next interval.
Allan
Message was edited by: Allan Eckert

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