Backups with Ubuntu BackInTime onto a Synology DSM5 via SSH

readme.md

Howto

Source: http://wiki.qedinux.be/index.php?title=BackInTime_to_Synology_DSM_5 and: http://techanic.net/2014/04/12/configuring_ssh_and_scp_sftp_on_dsm_5.0_for_synology_diskstations.html

WARNING

Not everything here is explained. You need to know what you do. Also: DSM Updates will change your settings!

Steps

• Make a new volume named volume1 (if it doesn't exist yet)
• Enable User Home Service (Control Panel / User)
• Make a new share named backups on volume1
• Make a new share named volume1 on volume1 (It must be the same name)
• Make a new user named backup
• Give to user backup rights Read/Write to share backups and volume1, permission for FTP
• Enable SSH (Control Panel / Terminal & SNMP / Terminal)
• Enable SFTP (Control Panel / File Service / FTP / SFTP)
• Since DSM 5.1: Enable Backup Service (Backup & Replication / Backup Service)
• Log on as root by SSH
• Modify the shell of user backup. Set it to /bin/sh
• Make a new directory /volume1/volume1/backups

mkdir /volume1/volume1/backups

• Mount /volume1/backups on /volume1/volume1/backups

mount -o bind /volume1/backups /volume1/volume1/backups

To auto-mount it make a script /usr/syno/etc/rc.d/S99zzMountBind.sh

#!/bin/sh

start()
{
       /bin/mount -o bind /volume1/backups /volume1/volume1/backups
}

stop()
{
       /bin/umount /volume1/volume1/backups
}

case "$1" in
       start) start ;;
       stop) stop ;;
       *) ;;
esac

and make it executeable:

chmod +x /usr/syno/etc/rc.d/S99zzMountBind.sh 

• Make sure the persissions are correct for SSH

chown 755 /volume1/homes/backup
chmod 700 /volume1/homes/backup/.ssh
chmod 644 /volume1/homes/backup/.ssh/authorized_keys

• On the workstation on which you try to use BIT make SSH keys for user backup, send the public key to the NAS.

ssh-keygen -t rsa -f ~/.ssh/backup_id_rsa
ssh-add ~/.ssh/backup_id_rsa
ssh-copy-id -i ~/.ssh/backup_id_rsa.pub backup@<synology-ip>
ssh backup@<synology-ip>

• Now you can use BackInTime to perform your backup to your NAS with the user backup.