Now, that has nothing to do with the speed of the NAS, because more than likely you will have connected the NAS to your router via ethernet.

At 802.11n speed, you'll be at roughly 300mbps. at 802.11b speeds, you'll be limited to 11Mbps, regardless of the device.

MacOS, Windows, or otherwise, if going over WiFi, you'll be limited to the speed that your router negotiates for WiFi. If you're using it for anything mission critical then use redundancy and do regular back ups.That doesn't sound right.

You have to evaluate your own needs and decide if you want to lose 1/3 to 1/2 of your available space to redundancy or if you can live with possibly losing everything. I'm also only using my NAS to store Videos, Music & Application installs, there's stuff I would be pretty annoyed to lose but nothing that would put me at any risk. I'm happy with this because I have a USB HDD plugged into my NAS and a folder sync Cron Job running every 24 hours to make sure any new data stored on the NAS will be copied over to the USB (at most I lose 24 hours worth of data) so if the RAID fails all my data is still safe. On my NAS I use BTRFS in a RAID0 but I do this knowing there is no redundancy, if it fails I lose everything.

I'm not going to go to much into these, both will do the job fine, ZFS does require a lot of RAM though (the complexities only really matter at a larger scale than home use). The usual filesystems used on a NAS are BTRFS or ZFS. It depends on what you are storing and if you plan to keep backup.

Best nas for home use 2019