Re: [opensuse] Undelete

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Carlos E. R. wrote:

The Sunday 2007-05-27 at 07:53 -0700, Randall R Schulz wrote:

That's not completely true... old Vax VMS file names had also a
version number. You could have "file.ext;1", "...;2", etc, so you
could go back and retrieve an older version of the file you were
working with. Nice feature, except if the admin had limited the
number of versions to two or three... which my teacher did.
And there's a even a very limited counterpart in the Gnu tools: The "cp"
command's --backup and related options.

You can also set up rdiff-backup to periodically make incremental
snapshots of select portions of your file system.

But of course, a real backup and archive system is an important
ingredient in any data safety setup.

Absolutely.

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.

Backup does give some data security but one also needs to be able to
handle the situation where one gets a gradual corruption of data. (A
couple of early viruses only made small changes to data over time, by
the time the infection had been detected the integrity of the backup
sets was at best suspect). This also the case with a failing hard drive,
or drive support hardware.

The only solution I can see is the use of external media sets. While
commercial outfits can afford the hardware and personnel to make
differential systems work well with external media and more
sophisticated strategies, there is not really anything reliable and easy
to use for home users in this category.


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