1. Looks like that NAS was originally sold with up to 40tb capacity so it shouldn’t have any issues with larger drives. Seems like the “my cloud os” is based on Linux so unless WD built in some weird limit, it should work with 20tb drives.

2. I don’t have an answer here, never had to rebuild an array. You might be able to use clonezilla which can do a block by block copy of disks and then expand the volume in the OS if it supports it. This is just conjecture, I’ve never done it with a raid array.

It’s in perpetual beta and is free as long as you don’t want to run multiple copies at a time. I had so many DVDs to rip I bought a license. It can also rip UHD Blu-rays if you have the correct drive. Not sure why it would say it’s too old, are your date settings in windows correct? The forum is filled with people doing exactly what you describe and is a great resource. https://forum.makemkv.com/forum/viewtopic.php?f=1&t=20579

MakeMKV is pretty much the standard for ripping Blu-rays. You can then use handbrake to reencode to something more efficient.

Love me some Sumatra, the biggest benefit to me is using it as the PDF previewer engine in windows explorer. 10x faster than the built in or adobe previewer. Takes a little work to do but since I’m frequently scanning through PDFs it was worth the effort.

There are utilities that convert mp3 to midi. That might be an easier route.

Brother lasers are pretty great.

I just got 2 of these (x22 version) for my Jellyfin. Supposed to be here tomorrow! I don’t think I could drop $1k for that many.