A better way how to install Crashplan 4.8.0 on Synology NAS is to use a Docker. Here is a step by step manual how to install and configure: https://blog.rylander.io/2016/12/12/setup-crashplan-in-a-docker-container-on-synology/
- then inside the docker container details add volume as /FOLDER -> /storage/FOLDER
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Step by step install manual on DSM5.x with Intel CPU: www.hanselman.com/blog
Some tips and tricks (install, configuration and known issues):
http://forum.synology.com/wiki/index.php/CrashPlan_Headless_Client
How to install Crashplan on Synology with PPC cpu (DS413 for example):
http://forum.synology.com/enu/
http://forum.synology.com/enu/
How to fix crashplan after DSM 5.1 update:
https://www.simplicate.info/