By default, CrashPlan excludes directories such as /var or /etc. However, it is easy to add these as directories to selectively backup. I’ll show you how!
First, edit the following file:
$ sudo nano /usr/local/crashplan/conf/my.service.xml
Optionally you may wish to delete the line for /etc as well to make that available for backups.
Save the file, the restart crashplan
$ sudo /etc/init.d/crashplan restart
Now when starting CrashPlan, it is possible to selectively choose directories inside /var to backup with CrashPlan.