I suggest going with what you are, or or willing to become, most familiar with. The simpler the better. And expect it will break, therefore build a contingency for that breakage. In my case, I'm using an Intel NUC with a Pentium N3700, a dyconn USB 3.0 hub, and a bunch of laptop drives in enclosures connected to that hub. Fedora 25 Server is the OS, Btrfs is the file system. The primary volume is just a single disk volume, using samba to share with Mac/Windows/Linux; and periodically the shared subvolume gets snapshot, and use btrfs send/receive to replicate the incremental changes to additional independent volumes (the USB 3.0 drive). There's 5 copies of the data locally; three of which are independent copies. An additional independent subset of that data is "in the cloud" so that it's off site. It's a very basic setup but it's also been stable. But I'm also really prepared to lose any of the copies at any time. Even if I were using XFS on LVM, I'd still keep this many copies. Chris Murphy