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You can either host it on your own server or find a free public server. I self-host it for just me (one user) and it works. It's PHP so the setup should be pretty easy.

I run my Nextcloud instance (for me and family) on a Raspberry Pi 3. The web interface is fairly slow because of the hardware (and likely my configuration :p), but it serves nicely as a Dropbox replacement.

Use cloudron.io for a personal solution (it's in digital ocean marketplace as well). Nextcloud is an installable app there

https://nextcloud.com/install/#instructions-server

https://nextcloud.com/install/#install-clients

I've installed it for personal use before but now use Hetzner:

https://www.hetzner.com/storage/nextcloud