CrashPlan is an excellent piece of software, agreed. I am also using CrashPlan Online to get an offsite backup running it in head-less mode on my Synology. There is, however, a pitfall involved if you like me are using TimeMachine for your local in-house backups, and then want to use CrashPlan Online to store those TM backups offsite.
The way that TM uses hard links in the file system to reduce the backup size, effectively making every incremental backup a full backup, is not at all compatible with CrashPlan. CrashPlan will instead resolve those links as being individual files, while in fact the hard link points to the same file, resulting in the TimeMachine backup becoming both inconsistent as well as MUCH larger. A 2 TB TimeMachine backup ended up becoming almost 8 TB in size when backing it up to CrashPlan Online when I tried this.
So sticking to CrashPlan only is a much better choice in this scenario.