Yes, XMPP with proper TLS on the server side and Conversations or one of its forks (preferably fetched from F-Droid) using OMEMO encryption should be good enough. If you are brave or paranoid, give Tox a try: https://tox.chat/
Yes, XMPP with proper TLS on the server side and Conversations or one of its forks (preferably fetched from F-Droid) using OMEMO encryption should be good enough. If you are brave or paranoid, give Tox a try: https://tox.chat/
Maybe the first question is what your budget is, both regarding money and time. For example, you could buy a pre-configured NAS from Synology or QNAP, which requires less technical skills but more money, or a home-made solution reusing used components (but fresh disks for reliability). Depending on your electricity costs, you may want to choose a low-power solution or something which you power off when not used. For storage, maybe a three-disk RAID5 is a good compromise. For backups, plain S3 cloud storage encrypted via restic is a good idea.
Well, you have Finland in the north-east, Ireland in the north-west, and every land border faces a Euro-zone country. Few other countries can claim the latter.
If at all, you want to use Gentoo’s ebuild system, which can be seen as some kind of superset of PKGBUILDs. I guess one could write a Python script that “dumbs down” ebuild scripts to PKGBUILDs for simple packages (excluding complex stuff like kernel, KDE, …). The main challenge, as pointed to before, would be maintaining a table mapping package names between distributions in order to get the dependencies right.
KDE Connect has been mentioned before. You can supplement this and other tools by using a VPN so that both endpoints can see each other even if the underlying network does not allow this. My preferred solutions are Tailscale (managed, cloud-based) or Headscale (for self-hosting).