Clarify Dom0 backup and restore process

Make clear that Dom0 backup only applies to /home/ and give an example of how you might try to backup system files. Also point out that any packages can/must be reinstalled on a fresh system.
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@ -21,6 +21,23 @@ This is true of all computing, not just the use of Qubes.
Data loss can and does occur in myriad and unexpected ways. Data loss can and does occur in myriad and unexpected ways.
A standard recommendation is to make backups at least weekly: three copies in two different formats, one off-site. A standard recommendation is to make backups at least weekly: three copies in two different formats, one off-site.
Backing up changes to Dom0
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NOTE: If you use the Backup Qubes tool to backup Dom0, it only backs up files in the home directory.
If you have files in Dom0 that you want to save, you should put copies of them in your home directory before running Backup Qubes per the instructions below.
An example of how to back up files from /etc/ if you created qrexec policies (named *local.mysql*, *local.ssh*) and altered *guid.conf* would look like the following:
yourname@dom0 ~]$mkdir ~/systemfiles
yourname@dom0 ~]$mkdir ~/systemfiles/etc
yourname@dom0 ~]$mkdir ~/systemfiles/etc/qubes-rpc
yourname@dom0 ~]$mkdir ~/systemfiles/etc/qubes-rpc/policy
yourname@dom0 ~]$cp /etc/qubes-rpc/policy/local.* ~/systemfiles/etc/qubes-rpc/policy/
yourname@dom0 ~]$mkdir systemfiles/etc/qubes
yourname@dom0 ~]$cp /etc/qubes/guid.conf ~/systemfiles/etc/qubes/guid.conf
To restore these files you would have to move them from the restored directory in your home back to their appropriate locations in /etc/ after the restore as described below.
If you are rebuilding your system from a fresh install and you had installed additional packages in your dom0 you will need to reinstall the packages into your new dom0.
Creating a Backup Creating a Backup
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