Just to report it, i finished the partial dumping process, took about 4 hours but went right. All the parts were joined successfully and have 29.1gb final.
I just finished the REINX guide and were at the NAND backup part, so i'm extremely new to this Switch scene and all. If it is possible, where and how could i do it?
Edit.: I did find partial NAND dump with the Hekate. How much trouble do i have to change between ReiNX and Hekate?
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day