Thomas

If you do not trust Tailscale as a company, here is an open source re-implementation of the server called headscale. Some/all clients are open source as well. So, you can review all components yourself or pay for a professional third-party review. Otherwise, if you take a binary blob from any origin, including Tailscale, and have it run with privileges on your server, there are few limits on what this blob can do. Yes, backdoors are technically possible, but probably bad for Tailscale’s business if that ever came to light.

Det finns Blocket och Tradera för att försälja saker. Inget garanti att du hitta köpare. Om du har större mängder som du behöver bli av med på kort varsel kolla på lokala företag som ta hand om dödsbo, dvs som köper allt på en gång och som på sin tur säljer enskilda delar. Priset du får kan dock vara ganska lågt.

My setup is smaller, but when my venerable old router died about a year ago, I acquired an Asus TUF-AX3000_V2 where I installed FreshTomato. One can login via SSH and dump all settings for backup. Likewise, individual or all settings can be done on the command line instead of the GUI. I have a script on my computer that reads CSV files with MAC addresses and more to apply changes in an automated way.

Google is outsourcing their job to you, because you doing it for free is even cheaper than paying some poor fellow in India a dollar a day.

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).

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.

Mal als Beispiel wie das in anderen Ländern (Schweden) gemacht wird:

Das da ein freundlich-lächelnder Mann in rot steht, ist nur fürs Pressefoto. Normalerweise Selbstbedienung. Der ganze Apparat kan in der Höhe eingestellt werden. Vorne die Fläche ist für eine digitale Unterschrift, die auf die Karte gedruckt wird. Bezahlt wird dann per Bank/Kreditkarte. Alles papierlos.