Translation memory management utility


So I used the Upgrade TM plugin to tidy up all my TMs, then used the Translation Memory Management Utility to clean duplicate entries. The "create backups from changed files" box was ticked (which I believed would perform the cleaning activity and create a backup of the TMs). Instead of this I am now left with my initial files with the following extension - "TM name.sdltm.backup", which cannot be opened/does not appear to be my TM anymore. The original TMs are nowhere to be found... Can you help? Have I lost my TMs? 

Thank you for your help!