How to undelete files from NAS volume?
Unfortunately Open-E has no build-in file “undelete” function for network data.
To restore your data you have to create backups, use data replication or snapshots.
Also 3rd part software may be helpful like http://www.ufsexplorer.com/rdr_xfs.php?lang=curr .
Open-E is Linux-based system so you may find this article helpful: http://linuxwebdev.blogspot.de/2005/06/xfs-undelete-howto-how-to-undelete.html .