I know it's too late, but for anyone looking at this post:
Set up my SD card for ReiNX because the guide didn't tell me that a Hekate backup was cleaner.
You probably followed a ReiNX guide, not a hacking guide, right? ReiNX guide only cover ReiNX installation, not proper prior steps you should do to hack your switch BEFORE using reinx (such as proper clean hekate NAND dump).
The guide also told (I didn't verify recently) users to make a dump, THEN update the console officially (would be bad with available 6.2 fw).... which burns the fuses and make the dump just made few minutes ago useless right away. (either update, then dump, or update without burning fuse, or else a backup is useless)
I already mentioned these issues on the reinx guide, but I don't know if my voice was loud enough to prevent users issues (apparently not, if it's the guide you followed). when I write a guide I think about users, while other guide writers might think about guide complexity and whether it's their interest or responsibility to cover more information than needed. I find it's too bad that it's only covering the cfw usage, and not a proper way to secure a user's console, explain about fuses, etc.
Only now am I told to ensure my SD card is 32GB.
I don't know about the reiNX toolbox, but hekate doesn't require the SD card to be at least 32GB. if you have a FAT32 SD card, a smaller than 32GB SD card, or not enough free space on your exFAT card for a single file dump, then hekate dumps in "multi part" mode, 15 chunks of 2TB each. once full, it asks you to backup all the chunks on your computer and put the SD card back to continue the dumping process from where it stopped. when you have all the NAND dumped in 15 chunks, you can merge them all into a single 32GB binary file on your computer.
I didn't thought about using memloader to restore raw partitions, that's also a way to do it (both dump/restore). But if you are using RCM payload to restore your file, why not use hekate payload? it's just in case you can't format the SD card to exFAT at all ? no computer to format to exfat? or just want to keep the card in fat32 maybe.