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The full functionality of Nextcloud, however, is accessed and managed through its web interface via any modern browser on any platform. If you want to self-host Nextcloud then it can be installed on any Linux computer. It can also be installed in Windows and macOS systems using a Virtual Machine. A popular option is to use a Raspberry Pi as a low-cost Nextcloud server. We do have concerns about whether these machines have the oomph needed for the job, although this may be addressed by the much more capable new Raspberry Pi 4 (especially models with 4GB of RAM).
NextCloud: A Dropbox alternative: Introduced by previous developers of ownCloud, NextCloud remains to be one of the, if not the most popular open source cloud storage software. Being open source, anyone can install NextCloud for free. The only service the user will pay for (and at a very small amount at that) is the private server in which they host it on. Now it’s apparent what some may already be thinking – “Google Drive is free to use as well”. This is true, yet both Dropbox and Google Drive still have data limits or are not entirely “private”. This is the advantage of NextCloud being a self-hosted cloud storage platform.
Nextcloud is developed by Nextcloud GmbH, a German company started by ownCloud inventor Frank Karlitschek. As open source software that can self-hosted or remote-hosted anywhere, however, where Nextcloud GmbH is based is largely irrelevant. What is relevant is the jurisdiction under which the data is stored. In most countries, police have the right to seize personal computer equipment suspected of being involved in a crime, and data centers will always operate in accordance with local data retention and surveillance laws.
Nextcloud gives you access to all your files wherever you are and whatever device you use. The easy web interface allows you to share files with other users on your server, to create and send password protected public links, to let others upload files to your cloud and to get notifications on your phone and desktop when a user on another cloud server shares files directly with you. And you can do all these things from the desktop or mobile clients, too. The Nextcloud Calendar and Contacts apps allow you to store, sync and share your plans and contacts. You can share with users or groups on your server or sync the calendar or contacts with your devices and access them wherever you are. The Calendar and Contacts app feature: Easy to use interface, Private and shared calendars and addressbooks with permissions management, CalDAV and CardDAV sync with third party clients both on mobile and desktop (i.e with Thunderbird). Find additional info on Nextcloud like Dropbox.