Unknown said:
And why wouldn't the installation on the backup work.
You're far too pessimistic. Would you suggest making two backups in the
event one doesn't work?
Do you know of anyone making two backups?
I *always* have two backups. A backup isn't a backup unless it's backed up.
The time to discover that your backup is no good is when you need to restore
it in anger. *And* I periodically check that my backup is capable of being
correctly restored by restoring it to an old gash hard drive.
But it doesn't help if the seeds of the failure mode are on both backups.
To take a real life example: someone I know had a PC where it refused to
hibernate (There were many other niggling problems, but I pick this one as
an example). Having completely failed to overcome this (and the other
problems), we restored one of his backups. This fixed the hibernate
problem, except that it occured again within a week. We discovered that
everytime the backup was restored, the PC could only be hibernated 6 times.
On the 7th attempt, it broke. This was alarmingly consistent.
No problem (we thought), having rescued the important data, we restored the
grandfather backup (1 week older). We discovered the same problem except
this one could be hibernated around 15 times before failing. And again it
was consistent. Many of the other apparently cured faults reappeared with
consistency. We never solved it or explained it. In the end, we just had
to rebuild the system.