A basic understanding of UNIX commands is needed here. If commands such as ls, cd, cp, etc. are foreign to you,
read through a Linux primer online, or get help from a friend.

From a terminal window, ssh to access.engr.oregonstate.edu and login with your ENGR account.
Choose your terminal emulation (xterm will usually do the trick):

Snapshots are enabled in both home directories on stak and on research file servers such as depot.
Every directory on stak and depot has a .snapshots directory. It is hidden, so once in the directory you are looking to restore, simply change directory (cd) to .snapshots

As an example you might cd ~/Windows.Documents/Desktop/.snapshots to see the snapshots of the directory ~/Windows.Documents/Desktop
~ is a shortcut to your home directory on stak.

Or for files on other file servers, use nfs to browse (cd /nfs/depot/xxx/xxx.../.snapshots). 
In this example, the file I wish to restore is in depot/cce_u1/montagne:

Using ls, list the directory contents to see all the snapshots (hourly and daily snapshots are shown as directories).

Change directories to the snapshot you wish to recover from with another cd command:

List the contents and using ls and you will see the files in the directory from that snapshot: Use cp to copy the file. In this example I am copying previous version of Visionapp.vrb back to my home directory and renaming it Visionapp.vrb.new.