that's it
if you have Go installed on your machine, just do : go get -u github.com/codenoid/go-mass-image-mirroring
or Download the release here
$ go-mass-image-mirroring --help
Usage of go-mass-image-mirroring:
-save string
-save /path/to/save/mirror/result
-source string
-source /path/to/folder/that/contain/images
Before -> After