

Btrfs raid5/6 support is unstable/experimental and cause some serious issues in the past, so it isn’t really recommended.
Since you only have 4 drives you could do a pair of mirrors with btrfs, but you aren’t guaranteed to be able to handle two drives failing (depends on which two drives fail). So zfs with raidz2 is the best protection you can get, and it matches the capacity you would get from mirrors.
Rebuild time isn’t great, but you would need a second drive to fail plus at least a read failure on another drive before you have issues.
A bigger question would be how soon would you have a replacement? If you already have a spare on hand I wouldn’t worry about rebuild time at all, but if you are expecting to wait potentially weeks for a warranty replacement your chances of the second failure go up.
Even if you had a second failure and additional read failure is unlikely (how often do you see read failures when you run a scrub). Combine that with your backups… You should have very little to worry about.
If two drives failed and you ran into a couple of sectors that can’t be read ZFS continues to operate just fine, except for the failed file. The file with the failed blocks shows up in zpool status so you know exactly where the corruption is, and you can just copy that single file from your backups and everything is back to normal.
If your files are mostly WORM files like media/documents then your backups cover you really well and copying a file or two from backups isn’t a concern. Vs if you are running virtual machines or DBs that are writing to their virtual disk constantly then you would start to worry about how much data you lose by rolling that file back to your past backup.

E=mc^2
Energy and mass are just different measures of the same thing. The transporters job is to take mass and turn it into something that it can more easily move around (a wave? Particle stream?) and back. So as long as the transporter is connected to the ship’s energy supply it should theoretically be able to use that energy (instead of the energy from your body) to reassemble any pattern it wants without breaking the law of conservation of mass.
Riker is 6’4 let’s say 200lbs, which is 8,153,369 terajoules.
One watt is one Joule per second, there is some debate out there about the “per” part of the quote since watts already implies per second, but we probably assume the ship is capable of generating 12,750,000 terawatts, or 12,750,000 terajoules per second.
8,153,369/12,750,000 gets us about 0.64 seconds of the ships output to create our duplicate Riker.
However the quote above was when the ship was basically idling, (not actually at warp) so the actual output of the ship is likely exponentially larger.
Basically they have so much power available, that they can just rearrange it into whatever mass they want.