> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Abel Talaversn Estevez > Sent: Monday, October 31, 2005 6:23 AM > To: misc@openbsd.org > Subject: Make a backup > > Hi all, > > I'm using OpenBSD in a firewall which runs 3.6 and I want to upgrade it > from > 3.6 to 3.7. > > I have two different machines, one running 3.6 and the another one running > 3.7. But I want to do an automatic upgrade from one running 3.6 to 3.7. I > have an image of the 3.7 firewall and I want to backup the 3.6 one and > install the 3.7. > > If I make the backup with 'dd if=/dev/wd0c of=/image bs=512' the image is > a > file of about 2 GB because the hard disk is of 40 GB. But with a 'du -sh > /' I > can see that all files are only 221 MB. >
The "dd" utility copies the disk blocks, even if they are empty. I would expect that you would want to copy the entire /dev/wd0 to another device. You can compress the image to make it smaller.
