Hey guys, interesting project you have. I just tried to get Nextcloudpi working on a Raspberry Pi Zero W - it doesn’t seem to work out of the box. Not that it is a perfectly good idea, Zero would probably not be convenient anyway.
Main problem seems to be the PPA used for PHP7.2, provided debian packages require ARM7, Zero is on ARM6.
Maybe updating the bit on the webpage saying “Raspberry Pi (all models)” should be updated.