On 16.03.2014, CS DBA wrote: 

> Here's my question:  If I simply backup all directories (including ones like
> /proc & /media, etc) will the following work, or do I need to care about
> specifically excluding the virtual directories?

I would run any backup/restore of the root filesystem only when booted
from an external medium, to avoid problems with locks. What I do (and
what would also work in your case) is:

1. Download sysresccd: http://www.sysresccd.org
2. Install the image on a memory stick:
   isohybrid sysresccd-image.iso
   cat sysresccd-image.iso > /dev/sdX
3. Boot from it
4. Backup your partitions: rsync -avxHSAX /source/ /target

To switch back to your system as it has been before a faulty update:

 rsync -avxHSAX --delete /target/ /source

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