add backup object command

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
update man manual

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
increase version and update documents

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Merge branch 'devel'