CrashPlan

When I built my main FreeNAS server, the machine it replaced was put into backup duties with a nightly replication created to move some of the files from one (freenas1) to the other (freenas2).  freenas1 has 9 x 4TB drives configured in an RAIDZ2 pool (similar to RAID6) which means that any two drives could fail, and I wouldn’t loose any data, but everyone should know that redundancy is no substitute for a backup!  Using two drives for parity, along with the ZFS overhead leaves me with around 24TB of useable space on freenas1.  freenas2 only has 5 x 4TB drives, but these are just configured as a stripe (like RAID0) so provide more storage at the expense of any redundancy.  It leaves me with just over 18TB of useable space, so not enough to backup a full freenas1, but certainly the most important stuff. (more…)