to add to the previous posts, here goes
RAID1 on Debian Sarge (It is a step by step guide)
I think ubuntu has raid support already compiled in the kernel.
Anyway the guide explains what I talked about before, which was that one drive
can be built from the other. Extract:
<<We'll then copy over the contents of all the /dev/hdax partitions to /dev/hdcx, then boot to the new RAID1 device, add back /dev/hda, and let the RAID1 system rebuild /dev/hda>>
I do not mean to be grumpy, but I did say
"There is a great howto software raid in the tldp"
Could you not google for that? You had to wait for the link?
Google howto raid tldp
give the right link at the top!
This is 2-way process, people are keen to teach and help.
At the same time sometimes they hope to learn from the feedback, or from solving problems.
Some people are really really kind and will give full answer.
I am less like that, teach how to fish is essential in my opinion.
[ok you might not have much time... But I think expecting some homework is fair.]
Anyway I am grumpy actually. Do not take offense. It was just a comment
[PS Another solution, instead of raid, you could just have a cron job of some kind
that just do a dd from one drive to another every so often,
see lq thread "learn the dd command"]