The r4s doesn’t have eMMC where as the r6s does. I just left the SD card as rw, I’m not too concerned about failure, I’m hoping for some wear leveling built in, if not SD cards are cheap. I should probably clone the disk and have a cold spare SD card.
Storage wise I’m using 17. 63MiB of 29.38GiB, I think I may have bought a too big SD card Ram usage is around 88MiB of 3.87GiB I have got a couple of more things to set up like wireguard but as it stands I’m glad I went the openwrt route over a full server install
I went through this at the beginning of the year, it get 900/900 fibre, settled on openwrt running on a nanopi r4s. My other options were a nanopi r6s with openwrt, or nuc type hardware/server running something like pfsence/opnsence etc. The openwrt install took about 5mins then a couple of hours of exploring various menus options etc, which I didnt end up changing.