The problem with rsync is that it would have to traverse all the FS tree and check every single file on both sides for the timestamp and the file. In a relatively small FS tree is just fine, but when you start having GBs and GBs and tens of thousands of files, it becomes somewhat impractical.
Then, you need to come up with other creative solutions, like deep syncing inside the FS tree, etc. Fun times.
Add checksumming, and you probably would like to take a holiday whilst it copies the data :-)
Then, you need to come up with other creative solutions, like deep syncing inside the FS tree, etc. Fun times.
Add checksumming, and you probably would like to take a holiday whilst it copies the data :-)