Don't just think if you backup
/etc/passwd you'll be ok.
You should backup all the following
to be safe:
/etc/passwd
/etc/group
/etc/gshadow (not on all flavors)
/etc/shadow
If you really want to be safe
about backing up all your system
configurations make sure to get
everything under /etc
It typically is under 5 megabytes. NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.