With A/UX 3.0, you can do an automatic update of A/UX from version 2.0 or
version 2.0.1 if your disk has a minimum of 30MB of free space, and if your
partitioning scheme matches that of A/UX 3.0. The free space accommodates
the increased size of the A/UX file systems. If your system doesn't meet
these two criteria, then we offer two updating utilities. These are
similar to the utilities provided with earlier versions of A/UX to find
files that need updating and to help you back up those files. Then when
you install A/UX 3.0, it repartitions your disk and copies back your system
and user files.
The A/UX 3.0 Installer updates existing A/UX 2.0 and 2.0.1 installations to
3.0 in the same manner as the installer used in A/UX 2.0.1. Basically, if
the target disk is already set up for A/UX, it skips the disk formatting
stage. During the UNIX package installation, outdated 2.x files are
REPLACED by their newer 3.0 counterparts. The sizes of these replaced
files are used in the free space calculation so that an enormous amount of
free space isn't required.
As always, the installer IS NOT a substitute for backing up your disk drive.
Make a habit of backing up daily or weekly to ensure the protection of your
user files, and any changes you make to the system software.
In addition, A/UX 3.0 continues to support the Autorecovery feature. This
feature allows you to recover key system files and get the A/UX computer
back into a stable state.