I have working Ubunutu 12.0.4 production server. Want to copy it's 650 GB HDD (only 30-40 gb used, but partitions fit HDD totally) to 500 GB hdd so that I can just replace HDD's and turn on server again without time waste. After 0time of researching on google I found tool named DD. but it's copying RAW data of HDD's and destination HDD must be exactly same size.
What tool can you suggest for this reason?