You really should use a proper tool for the job. Something like
partclone. That way you don't waste time & storage since you'll be
saving *only* the used blocks. I mostly use CloneZilla (that uses
partclone) but you can install partclone [1] in Fedora.
Please note I will not be cloning my partition but just the contents of the root logical volume.
The partition will still exist.
The reason I am doing this is because I want to move to thin LVMs, rather than the old CoW LVM.
Is partclone the write option? Or am I better off with dd ?