For your usecase a pi should be sufficient. You can go with a pi 5 8GB and a docker install, so you can host more stuff later. I would recommend an m.2 head with an SSD instead of an SD card though. Much faster and more reliable.
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Nextcloud sucks. Its better to have discreet docker services running for what you actually need vs nextcloud being a monolith of shitty plugins. As for hardware, go on eBay and buy a cheap optiplex tower. It'll get you started.