Hosting provider / data security?

If I sign up for a Nextcloud service hosted by a provider, how can I know that the host / provider does not access my data?

Thanks.

Encrypt your sensitive data with the End-To-End Encryption Plugin or other tool.

@Jabahosting - Many thanks for your quick reply !!

Is it possible for several end-users to have access to encrypted documents via a Nextcloud service?

Can they work collaboratively on the same encrypted document?

Thanks again.

No, that is not possible.