Mosh and NNCP will help a lot, but you need some good sysadmin
to set NNCP as the mail MUA/MTA backend to spool everything efficiently.
NNCP it's an expert level skill, but your data will be
sent over
very unreliable channels:
https://nncp.mirrors.quux.org/Use-cases.html
Also, relying on propietary OS'es is not recommended.
Apple and iOS are disasters to work on remote, isolated places.
No wonder no one uses Apple in Europe for any serious work
except for iOS development. Most science and engineering setups
will use anything else as a backend.
Most offline distros, like Ubuntu or Trisquel have methods of downloading the software packages
for offline installs.
On chats, Slack and Zoom are disasters. Any SIP or Jabber client with VOIP support will be far more reliable as it can use several different protocols which can use far less bandwidth (OPUS for audio) without having to download tons of JS to use it, even if you cached your web app it will still download tons of crap in the background.
And, again, distros like Debian have a full offline DVD/BR pack which ironically can be better if you got that by mail. Or you can just use the downloaded/stored ISO files with
apt-cdrom add -m /path/to/your/file.iso
This way everything from Debian could be installed without even having an Internet connection.
https://nncp.mirrors.quux.org/Use-cases.html
Also, relying on propietary OS'es is not recommended. Apple and iOS are disasters to work on remote, isolated places. No wonder no one uses Apple in Europe for any serious work except for iOS development. Most science and engineering setups will use anything else as a backend.
Most offline distros, like Ubuntu or Trisquel have methods of downloading the software packages for offline installs.
On chats, Slack and Zoom are disasters. Any SIP or Jabber client with VOIP support will be far more reliable as it can use several different protocols which can use far less bandwidth (OPUS for audio) without having to download tons of JS to use it, even if you cached your web app it will still download tons of crap in the background.
And, again, distros like Debian have a full offline DVD/BR pack which ironically can be better if you got that by mail. Or you can just use the downloaded/stored ISO files with
apt-cdrom add -m /path/to/your/file.iso
This way everything from Debian could be installed without even having an Internet connection.