>> It's a new feature in Windows Server 2007 (?).
>
> A new feature that Novell had in Netware 3.10 back in 1990.

And Amiga OS had premptive multitasking and a full GUI back when PC 
users were still playing with MS-DOS. Your point?

>> Of course, then you need to buy backup software expensive enough that it
>> backs up the hidden previous versions as well as the visible files...
>
> No. You just need to load $Day's tape (or DVD) with $day's version of
> the file.
>
> Presumably, your backup software's DB will be able to provide you with
> $Day.

The idea being that if you edit the file three times per hour, then 
three prior versions get stored. If your backup software is advanced 
enough, it can capture all of those prior versions. If it isn't, you 
only get the current version at the instant the backup happened. [Which 
is still far better than nothing, of course...]

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