• Enable home folders or make a new share
• Add a new user NEWUSER and add to the administrators group
• Enable SSH and allow your new user

• SSH to CloudKey as admin user ssh ADMINUSER@IPORNAMEOFCLOUDKEY
• Generate a new SSH key pair with ssh-keygen
• Copy SSH key to QNAP ssh-copy-id NEWUSER@IPORNAMEOFQNAP
• SSH to QNAP to make sure SSH key authentication works ssh NEWUSER@IPORNAMEOFQNAP
• List home directory (or share destination) pwd
• Exit back to CloudKey exit
• Update apt cache apt update
• Install rsync if needed apt -y install rsync
• Test copy of backup files rsync -r –delete /data/autobackup/ NEWUSER@IPORNAMEOFQNAP:/share/homes/NEWUSER/autobackup/
• Add rsync to crontab crontab -e

SYSTEM$ ssh ADMINUSER@IPORNAMEOFCLOUDKEY
CK# ssh-keygen
CK# ssh-copy-id NEWUSER@IPORNAMEOFQNAP
CK# ssh NEWUSER@IPORNAMEOFQNAP
QNAP$ pwd
QNAP$ exit
CK# apt update
CK# apt -y install rsync
CK# rsync -r --delete /data/autobackup/ NEWUSER@IPORNAMEOFQNAP:/share/homes/NEWUSER/autobackup/
CK# crontab -e

• Add S3 bucket as a storage space
• Create backup job of rsync destination to S3 storage space
• Configure backup job to remote deleted files

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "s3:GetObjectAcl",
                "s3:GetObject",
                "s3:ListBucket",
                "s3:DeleteObject",
                "s3:GetBucketAcl",
                "s3:GetBucketLocation",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::S3BUCKETNAME",
                "arn:aws:s3:::S3BUCKETNAME/*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": "s3:ListAllMyBuckets",
            "Resource": "*"
        }
    ]
}