https://fedoramagazine.org/transform-file-systems-in-linux/ I had not known that before. I don't need it right now but it might be useful in other cases.
Sounds interesting. First I've heard of this program. I have used FSArchiver before to accomplish a similar task; but is destructive in that you create a backup, then restore it, with a the option to create and restore to a different file system. http://www.fsarchiver.org/