A very detailed post about setting up CrashPlan Cloud Backup on a Synology NAS running DSM 5.0
Remember, any good backup strategy follows the Backup Rule of Three.
3 copies of anything you care about - Two isn’t enough if it’s important.
2 different formats - Example: Dropbox+DVDs or Hard Drive+Memory Stick or CD+Crash Plan, or more
1 off-site backup - If the house burns down, how will you get your memories back?