Now I am back in calmer waters I have been thinking about how to restore OS X from back up.
The G4 iMac was bought in Apr 2002 with OS 10.1.5 supplied installed [at least that is what I seem to remember] and with OS on CDs.
The internal hard drive was replaced in Apr 2004 and the repairer installed OS 10.2.7 but no CDs were suppled.
In Dec 2004 Apple Software Update provided OS 10.2.8 which has been used till now.
Still no CDs for re-installing OS.
When I make back up copies of the internal hard drive, using Disk Utility to write to LaCie external hard drive, there are various warnings that certain items cannot be copied.
No info is given about exactly what has not been copied.
Difficult to see if OS 10.2.8 has been copied or not, since I do not know which Filenames to look for.
So I have a suspicion that if my G4's internal hard drive gave up, or some other calamity happened, I might not have an OS copy on my LaCie external drive available for use in recovery.
If this is so, how do I make a copy of my OS 10.2.8 for use in a recovery?
Do I need something like CarbonCopy?
Or is the OS protected against copying?
I do not think I can buy from Apple any replacement OS for a G4 iMac - though I would like to be proved wrong.
I do have access to the CDs containing OS 10.3.9 which came with our G4 iBook, but I don't know if these could be used on a G4 iMac.
In any case, for various reasons involving access to old files, it would be preferable to stick with OS 10.2.8 if possible.