When backing up or restoring the RMS keys using the SecureStorageBackup utility in SCOM SP1, you may come across the following error:
Could not load file or assembly 'Microsoft.Mom.Common, Version=6.0.4900.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
To fix this, copy Microsoft.Mom.Common.dll from C:\Program Files\System Center Operations Manager 2007 to the same folder where SecureStorageBackup.exe is run. Then run SecureStorageBackup again.