A NAS for Jellyfin, backup, Pi-Hole and surveillance?

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If you build your own home NAS, you may consider installing TrueNAS (FreeNAS) system. This will allow you to create an FTP server. You can then set your cameras to send all recordings of movement to your NAS. There is no need for surveillance-specific drives. Any drive will do the job.
There is also OwnCloud to consider https://doc.owncloud.com/server/next/adm...e/ftp.html

I hope this helps.