This one is a keeper http://www.cgsecurity.org/wiki/TestDisk I accidentally tried to install Ubuntu over my 500gb data disk. It deleted the NFTS partition then wrote its own ext4 file systems to the disk. Fortunately it died with an error then I realised my mistake. The lovely folk over at expert sexchange referred me to this tool..
Free Hard Disk / Partition Imaging and Cloning Software
I recently found this method of doing the backup/restore http://www2.elastix.org/en/component/kunena/116-security/47135-how-to-backup-elastix-for-migration.html?Itemid=58 A few things to be aware of Make sure the Elastix version is the same or higher than the version that you are transferring the backup .tar file from. Otherwise if you try to transfer to an earlier version the extensions will not transfer across.