Upgrading to a bigger usb key

Hi, I created time ago a Librelec usb key and added all Kodi addons and configuring it. But it was only a 4GB usb key, so I'm planning to upgrade to a bigger usb key, because I think Kodi would benefit from that. A 32GB or 64GB one, I think. So I would ask you, if it's better to make a backup from inside Librelec, preparing the new usb key and then restore the backup (not sure if really everything is gonna be migrated, this way) or if it's better to clone the usb key with a cloning software, even if I don't understand how the extra space is gonna be usable by Librelec and Kodi. I hope you can understand my bizarre request and my poor english. Thanks in advance for your reply! Cheers