To be able to use CrashPlan, you'll need to install the [http://www.amahi.org/apps/crashplan CrashPlan] application on your Amahi HDA, configure it as needed, and install the CrashPlan application on all the computers you'd like to backup to your HDA.
<h4>Please Note</h4> Crashplan makes very regular writes/reads to the directory it's configured to store backups in. As such, it's best not to point the target directory with in a Greyhole pool, as the number of operations builds beyond a functional level. The backup folder is best placed on a non-pooled disk, or of another type of managed volume or filesystem, such as BTRFS, ZFS, an LVM volume, RAID array, etc.
==More about CrashPlan==