Data safety and durability is about managing risk. Here are just some of the risks JesusSaves manages to ensure your data remains safe: Failed Media Ever lose a file because it was on a disk or USB key that is no longer readable? JesusSaves uses the ZFS file-system to keep your data on more than one device. When any device fails, a replacement of the device triggers ZFS to replicate your data to the new device, without any loss.