I would not go with managed NC, because you can’t control nothing and provider raise prices over and over. Even with serverless Nextcloud deployment, the architecture is still like LEGO, and if something will go bad or price will be too high, then you can exchange those LEGO bricks, ie. migrate from Fargate to EC2 w/ ECS, migrate from Aurora to RDS Postgres or Postgres installed on EC2 and so one.