If I never booted sysNAND after hacking my Switch, wouldn't I be able to make another unmodified NAND backup with hekate now? I mean I am just trying to understand the reason behind everything, consider me a bare noob regarding this matter.Assuming SX OS does not make corrupted dumps, it should be fine although there was one person I remember being banned even restoring a clean eMMC backup. The only factor I could not remove was the fact that he made it through SX OS. Now I'm not saying you share the same chances of getting banned as he did but what I am saying is that there is a very small possibility that the backups SX OS makes are not clean enough to go online with. If you are still willing to take the chance, you should also perform the cleanup option in the SX boot menu after restoring the clean eMMC backup.
If I really have to restore a emuNAND backup, how would I proceed with it? Any help is appreciated so far thanks!