Carlos E. R. wrote:
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The Tuesday 2007-05-29 at 10:50 +0100, G T Smith wrote:
But you might work all day on a report, and on a stupid moment obliterate
it all. We all do such things some times... Or after long work, you decide
your last hour has been full of errors and it would be better to go back
in time. If the software is designed to save a version history of the
file, it might save our day on both cases.
Ummm...
I rather remember a variant of MS Word which incorporated not only the
current document but all changes to that document by default. Document
sizes suddenly rocketed, and subsequent document corruption due to media
limits being hit became a major issue. Also editing became more and more
difficult and slow as the document size increased. The response was to
turn this feature off.
I remember that. OOo also has this feature. What I talk about is
different: it uses one file for each version, with a version field in the
file name managed directly by the operating system, not the application
program. It is also different from external backup, as it is automatic and
continuous, and can be affected by disk failure, of course.
The newer Mac OS X does / will do this, AIUI. Apple call it "time
machine". When you turn it on the, e.g., finder window becomes
transparent, and you see a stream of windows into the past which you can
flip through to get the file version you want. When you plug in an
external hard disk and say you want to use it for backup, all the old
copies are duplicated to it. I've only seen the demo of this, however.
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