A) SFTP via the file manager would be great for a beginner level follow up article. It is mentioned in Step 13 of the article. SFTP support is built into the file default manager, PCManFM, and is very convenient for file transfers from one Raspberry Pi to another. If OpenSSH is active on the other Raspberry Pi, then the client Pi just needs to open PCManFM and enter the URI in the location bar at the top of the window:
Then after authentication, it is just like working with local files even though some are on another machine either across the desk or across the planet.
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B) An advanced follow up would be to set up the NAS using FreeBSD much like in the article, but with OpenZFS and RAIDZ instead of RAID-1