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Obnam could do with a plugin that just compresses data, without
encrypting it. Encryption might be unwanted, or unnecessary, for
example when backing to a USB drive that uses whole-disk encryption.
However, saving space by compressing data with gzip or xz is still
a reasonable thing to do.

The compression plugin would be similar to the existing encryption
plugin, but be triggered by a different setting.

* `compress-with`: program to compress files with; 
  default to gzip, but can be any program

--liw

[[done]]