tarmill compresses and encrypts tar archives, and
is designed for use in backup scripts. Unlike most
other solutions, each archive member is handled
separately, so damage in the middle of the archive
does not render the rest of the archive unusable; it
is possible to resume at the next readable member
header. Compressed and encrypted archives remain
valid tar files, so any well-behaved tar
implementation will be able to list (but not extract)
them.
