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To me data on mobile computers are even more likely to be damaged or lost than on desktop computers. So backups are even more important. There are different solutions for backups in mobile environments. I will describe them in one of the next issues.
For backups on removable media like CD-R/RW or DVD-R/RW you may boot from a Knoppix Live CD/DVD using the toram boot option. This way Knoppix will be completely loaded into RAM and you may remove the Knoppix CD/DVD from the drive to replace it with the backup media. Note: this will only work if your laptop provides more than 1GB RAM.