#wp-admin-bar-backwpup.menupop > .ab-item .ab-icon,
#wp-admin-bar-backwpup.menupop > a > span .ab-icon {
    background-image: url(../images/BackWPup20.png);
    background-repeat: no-repeat;
    position: relative;
    /* for WP lower 3.3  */
    float: left;
    width: 20px;
    height: 20px;
    margin-top: 3px;
	margin-right:5px;
	background-position:top center;
}
#wp-admin-bar-backwpup.menupop.hover > .ab-item .ab-icon,
#wp-admin-bar-backwpup.menupop.hover > a > span .ab-icon:hover {
	background-image: url(../images/BackWPup20.png);
    background-repeat: no-repeat;
	background-position:bottom center;
}

@media only screen and (-webkit-min-device-pixel-ratio: 2) {
    #wp-admin-bar-backwpup.menupop > .ab-item .ab-icon,
	#wp-admin-bar-backwpup.menupop > a > span .ab-icon {
        background-image: url(../images/BackWPup20_2x.png);
        background-repeat: no-repeat;
        background-size: 20px 40px;
		background-position:top center;
        position: relative;
    }
	#wp-admin-bar-backwpup.menupop.hover > .ab-item .ab-icon,
	#wp-admin-bar-backwpup.menupop.hover > a > span .ab-icon:hover {
		background-image: url(../images/BackWPup20_2x.png);
		background-repeat: no-repeat;
		background-position:bottom center;
	}
}