[Fwd: Q's on backup to CD-R]
DSC Siltec wrote:
Ross Boylan wrote:
>
> I'm trying to do a fairly comprehensive system backup to CD-R. The
> amount I have to backup is much larger than the free space on the
> system, which in turn is larger than a CD-R.
>
Just a thought -- I have heard that CD-Rs have a 1-bit per 100kB error
rate in 1 year. What that means is that in your typical 1-Meg program,
backed up to CD-R, you're not going to be able to use it after about a
year.
So CD-R would *only* be useful for short term backup, or if there were
multiple copies of the same program.
Therefore, what you might be interested in looking for would be a
program that archived newly modified files, and then a selection of old
files based on how long it had been since that file was last backed up,
enough to fill a CD. And not compressed, just written straight. Then,
it would write the "updates" to another master-CD.
Then, if it was necessary to restore system data, the program would ask
for specific CDs by number, and restore the proper files, either
double-checking with multiple copies, or running a checksum to be sure
that the files were still valid.
I don't know if such a backup program exists, though.
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