Hacking Question about restoring nand fat32 and exfat

[Rushhour77]

Hi, I have a full backup (nand, boot0, boot1 and more). Atm the nand backup (6.1.0) is split in 2GB files because I used a fat32 sdcard. I know these can/should be merged into 1 file. That would also mean that in case of restoring I will need exfat, right? If so, does firmware 6.1.0 has the exfat compatibility built in? If not, do I need to take action to get the compatibility now so restoring wont be a problem?
Im asking this because I was wondering what to do in case of semi brick.

Thx!