You can use an NFC share as the data dir mounted prior to installation or moved to it later via:
But it’s better you don’t mount shares within the data dir:
- Because www-data would need to own the whole share
- Because should you have any issues with it unmounting and remounting you could face corruption
- Because the external storage app was made for this reason
- Because mounting it as a folder in data will mean you shouldn’t use the share with other clients. Again due to corruption possibilities.