Is there a Disk To Disk copy software available that can be used to copy/backup> a disk that has FreeBSD operating system installed. I would like to copy my
> existing disk to another disk as a backup.
The dd utility allows you to make an excact mirror, I think you can even get a bootable mirror disk. But for plain backup purposed, I think it is more efficient to use the rsync utility, this will only transfer differences, so the second backup should be much faster.
A third option is to setup a raid. Raid-1 is for disk mirroring (if you have 3 disks you can setup a raid-5 and with four raid-0/1). Raid will keep your mirror updated live - but don't ask me about more details :-)
Cheers, Erik
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