On Jun 25, 2004, at 7:32 AM, David VanHorn wrote:

>
>> There are two functions of Source code control (like CVS.)  One is to
>> save older versions of software; you take a snapshot at each major
>> revision point, and then you can get back all the old versions if you
>> want to.  Or need to.
>
> Disk crash
Well, no.  Source code control stuff does not replace the need for
backups.

> or "aw hell, I just copied the old stuff over the new stuff"
>
That's more likely, although a lot of source code control doesn't do
much when you're actively editting something.  you can get back the
last committed versions, but if you just wiped out 6 hours work by
overwriting the source code with the jcl to compile it (been there,
done that), you're out of luck.

There's a separate feature, usually called "file versioning" or
something like that, that addresses that problem.  It's quite old, but
has (finally) started to reappear on modern systems via add-on
software.
Tenex, tops20, and VMS had it; it was great.  Chewed up disk space at a
prodigous rate, back when disk space was scarce...

BillW

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