Off grid digital music

Building a retirement home on an Island that is boat or barge access only.
We are off grid and generate power using both PV & MH.
We do not have access to internet but do get cell phone coverage.
Have a nice vinyl collection and turntables are no problem but digital I know zero zip.
My CD player is a Audio Research CD-7.5. I know it’s dated but it still provides me listening pleasure.While visiting a friend he used an Aurender N10 with a Berkeley DAC . The pleasure and ease of bringing musical choices forward on a tablet was a game changer for both wife and I.
So the quest begins.
My objective is to still get great SQ so my question are as follows.
1. Great sound quality from a server, looking at Melco, Aurender Innous....
2. Want to get a DAC that won’t be outdated in 12 months. Leaning towards the PS Direct Stream .
3. Since we are off grid does that mean that I won’t have access to all of the data of the albums ?
4. Roon Nucleus I believe that if it has access to all of CD’s and SACD once ripped, it can store all of the data on it’s hard drive. Then how do I control via iPad or Tablet. Need to set up a wifi or blue tooth in the house ?
Any help or suggestions would be greatly appreciated.
Thanks for your time.
My system