Summary from the Introduction to Linux by OnWorks

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No password = no data

If you can not remember your password, the data is lost. Not even the system administrator will be able to decrypt the data. That is why a copy of important keys is sometimes kept in a sealed vault in a bank.

9.5. Summary

Here's a list of the commands involving file backup:

Table 9-1. New commands in chapter 9: Backup

Command	Meaning
bzip2	A block-sorting file compressor.
cdrecord	Record audio or data Compact Disks from a master.
dd	Convert and copy a file
fdformat	Low-level formats a floppy disk.
gpg	Encrypt and decrypt data.
gzip	Compress or expand files.
mcopy	Copy MSDOS files to/from UNIX.
mdir	Display an MSDOS directory.
mformat	Add an MSDOS file system to a low-level formatted floppy disk.
mkbootdisk	Creates a stand-alone boot floppy for the running system.
mount	Mount a file system (integrate it with the current file system by connecting it to a mount point).
rsync	Synchronize directories.
tar	Tape archiving utility, also used for making archives on disk instead of on tape.
umount	Unmount file systems.