SYNOPSIS

 $0 [--repo /my/repo ] [--link /my/link] [--version release-x.x.x]

    [--path /my/path ( default $repo/data ) ]
    [--keep 10 (default 10)]

    Version 'release-x.x.x' and 'rollback:release-x.x.x' are the same
    Version backup refers to the $link.backup