- Media centre for Kodi or Plex connected via smb to a Xiaomi MIBOX (Kodi or Plex on the box connected via SMB to the movies and series) + Sickrage + openvpn
- Kodi is a client. However, it is possible to have the data on the machine, Kodi is on, shared to a streaming-client.
- Plex is a fork of Kodi, which developed into a server type system (and certain features are commercial now). Plex usually is only needed, if you want to stream over small bandwith connections, since Plex can transcode the stuff you send (lower bitrate on the fly). But for this you need a powerful machine. Look here, on the Reddit Plex board, for more. These are some really cool build ideas. Like this one, for example: Plex Server Build Recommendation - UPDATED $350, 12-Core, 24 Thread, budget powerhouse!
Kodi has much more community support than Plex. This means, it gives you much more and much recent services plugins for lots of media-streaming services on the web.
If you have a streaming client with a media-player, you do not really need Kodi or Plex. You can just use the shared folders. Of course, having a little bit of Media library is nice, with all the bells and whistles, so it may be best to use Kodi, have it build a media-library and then use one of the Android remote controls, which use all of Kodis media-library features. I think the MIBOX runs Android?
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- data storage for work : i need secure access to this data : sensitive data will be store on the NAS : sp maybe encryption on disk and nextcloud for external acces with ssl encryption.
- share data, calendar... with my wife ;
Won't comment on this one, since I don't know much about encryption on NAS.
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- i know that ZFS is a great FS but i'm not sure that i will need such a FS for my use. Further more, since i had a smal amount of disk right now, i will maybe extend my pool soon and i read ZFS couldn't handle it.
Both remarks are true. I use ZFS on a SmartOS (ex Solaris, Illumos derivate) host on a 16GB ECC RAM machine and I love it. As much as I hate, that expanding your storage pool needs a completly new setup. You can not just add one or more new disks to the old ones. That sucks big time!
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I also heard about XFS but i didn't find many explanation...
XFS has been developed by Silicon Graphics, mainly for streaming huge large media-files. It's also pretty stable. XFS is a good filesystem for media-files, but maybe not the one you need on a Home NAS.
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Then i read about the RAID.
Personally I dislike RAID. If I want redundancy (RAID 1) I better use a backup at home, plus, I back up my sensitive and important data encrypted to a cloud storage host. Is cheaper and more secure in the long run. RAID starts getting interesting with RAID5, but that is too resource hungry, especially since ZFS comes with RAID and volume-management built in. No need for a RAID controller, etc.
Now, the question is always, how much money you want to invest. I find those builds on the Reddit forum I have shown you to be exceptionally clever. Of course, YMMV if you do not need that much CPU power.
As for a modern and still affordable ECC system:
CPU: Intel - Pentium G4560 3.5GHz Dual-Core Processor ($78.89)
Motherboard: ASRock - E3C236D4U Micro ATX LGA1151 Motherboard ($219.99)
Total: $298.88
Of course, this needs ECC RAM (16GB+) enough HDD for your storage pool, a PSU, a case, fans and, eventually, an NVM SSD for the LARC2 cache and ZIL device. A 128GB device may suffice for this.
It may first seem expensive, but the only really expensive part is the mobo, which, however, is a real server-mobo, coming with ECC support, IPMI (you can boot, use. install OS, configure the BIOS, etc. over LAN from another computer, total management/remote-control) and allows you to plug a USB stick right into the mobo, so you can keep your OS on this USB stick and boot from that. This is pretty common now in servers. Usually they copy the OS to a RAM disk, then and run from there. Also, this is a pretty recent mobo, that comes with NVM support, which may not be needed in a NAS, except if you go for ZFS, then such a super fast SSD is the best thing to do (after high amounts of expensive RAM, lol) for the L2ARC cahce and the ZIL, which you store on the second partition. But these are all power-user features, you may not want/need, Others have pointed out the new AMD CPUs for ECC, but I would not recommend with this Pentium being cheaper and installable on a real server-motherboard.
I just wanted to point out, that these exist and allow for a small professional build.
However, if you go ZFS you must think different: Ideally you use a Solaris derivate (SmartOS or OmnisOS come to mind) with native ZFS support (SmartOS being a hypervisor OS and OmniOS comparable to a monolithic Debian server. Both also offer Solaris Zones, which is something like native containers/VM on steroids, including a port of the Linux KVM, which lets you run any OS as a Solaris Zone - otherwise only Solaris as Solaris Zone)
ZFS is memory hungry, it is greedy. It wants a lot of RAM for its LARC cache for optimum performance. Rule of thumb is 5GB RAM per 1TB storage. But this is really just a very rough value. Reality can look totally different, which may mean more RAM. In order to compensate for expensive DRAM prices, ZFS offers the L2ARC cache on an external disk device, usually an SSD, especially now with those NVMe SSD modules going in the GB/s regions one can come close to DRAM speeds. In theory at least. L2ARC and ZIL demands are very much debated on the net and offer depend on usage patterns.
So, ZFS done right is more expensive than just throwing your last PC's hardware at it.
I am well aware, that OMV is its own Debian distro and therefore senseless in a Solaris environment, but if ZFS is what you want, than I would go for the RealDeal(TM).
Otherwise you may want to take the hardware you already mentioned, read up a little bit more on XFS vs. JFS vs. btrfs vs. ext4 and then decide, whether you need RAID at all, now, that the Duplicati plugin is in "testing" and use any of the free cloud providers as a back up backend for the important content. And if Google Drive, Dropbox, etc. are too small/expensive there is Backblaze b2 support in Duplicati as well. Remember: an electrical faliure can kill both of your RAID-1 disks at once.
A more simple DLNA solution than Plex or Kodi may be advised, since you seem to use that machine only for serving data, not replaying it. You thin client (the media-streamer) doesn't need more than a DLNA server as a backend, or maybe just shares to browse.
