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# SFTP

Nextcloud’s SFTP (FTP over an SSH tunnel) backend supports both password and public key authentication.

The Host field is required; a port can be specified as part of the Host field in the following format: `hostname.domain:port`. The default port is 22 (SSH).

For public key authentication, you can generate a public/private key pair from your SFTP with secret key login configuration.

After generating your keys, you need to copy your new public key to the destination server to `.ssh/authorized_keys`. Nextcloud will then use its private key to authenticate to the SFTP server.

The default Remote Subfolder is the root directory (`/`) of the remote SFTP server, and you may enter any directory you wish.

See Configuring External Storage (GUI) for additional mount options and information.

See External Storage Authentication mechanisms for more information on authentication schemes.

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