I use Technitium the ideal set up, is put one in one region in one data centre and then another in another region in another data centre. This way the whole Internet would have to break before your website. Breaks this plus a strategy of good time to live policies Infrastructure should stay up forever.
I love the idea of nextcloud but it really seems pretty hostile towards hosters I would suggest looking at something like Cryptpad which is at least an upgrade to your personal security.