Changed from 20. December to 19. December for easier comprehension (viewing the calendar.)
The missing 'd' at 20. December is hardly noticeable compared to e.g. the 19. December.
one of the biggest issues with borg < 1.0 was that it had a default target chunk
size of 64kiB, thus it created a lot of chunks, a huge chunk management overhead
(high RAM and disk usage).
outdated - it just showed different levels of zlib compression,
but not we additionally have "lzma", "lz4" and "none" compression.
the "usage" and "internals" docs give some hints about them, too.
