On 2007.10.30. 13:21, Eric Böse-Wolf wrote:
> I did a few test and maybe someone is interested in the results.
>
> I did a backup of the linux kernel documentation, quite a lot of
> text ("du -sh ." gives 22M in the directory), under different
> conditions, each of those backups I wrote to a new file volume and
> here are the sizes of the file volumes:
>
> Keylength Compression(GZIP) Resulting Mediasize (Bytes)
> none no 17299177
> none yes 6638157
> 1024 no 18840845
> 2048 no 19751779
> 4096 no 21519151
> 1024 yes 8179802
> 2048 yes 9091106
> 4096 yes 10858478
>
> If you compress and you have a damaged tape, you will lose more date as
> if you did not use compression, but for encryption the tape is wothless
> with only a single failure to, so I think if you use encryption you can
> also use compression, if you have the CPU power for it. (The time a
> backup needed increased significantly with the keylength, but I did not
> measure exact times here.)
maybe this should be added to the wiki ?
> Yours sincerely,
>
> Eric Böse-Wolf
--
Rich
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