Chroniton::Archive - compresses old backups, but keeps metadata easily accessible
Archive all backups in the backup storage directory.
Creates a folder called archive_<date> containing three files,
data.tar.gz,
the compessed tape archive of all data in the backups,
logs.tar.gz,
all log files found in the backup storage directory,
and contents.yml,
the (usual) serialized file list.
