rclone

Install

apt install rclone

SSH

ssh-keygen

ssh-copy-id user@server1.example.com

vi ~/.config/rclone/rclone.conf

[server1]
type = sftp
host = server1.example.com
user = user
key_file = /root/.ssh/id_rsa

On the SSH server side

vi /etc/ssh/sshd_config

PubkeyAuthentication yes
PubkeyAcceptedAlgorithms=+ssh-rsa

AWS

vi ~/.config/rclone/rclone.conf

[data]
type = s3
provider = AWS
env_auth = false
access_key_id = 
secret_access_key = 
region = eu-central-1
location_constraint = eu-central-1
acl = private

[data_crypt]
type = crypt
remote = data:MY_S3_BUCKET
filename_encryption = standard
directory_name_encryption = true
password = 
password2 = 

Sync

rclone sync -i folder1 data_crypt:folder1