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.)
Yours sincerely,
Eric Böse-Wolf
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