I've written this post as much for my own benefit and reminder as for anyone else who's looking to run CrashPlan headlessly on a Synology NAS.

First of all, rather than repeat what you can find on several other great walk-throughs, I'll point you towards Scott Hanselman's guide. However, this doesn't tell you everything you need to know - I know it did when Scott wrote it because I followed his instructions and it worked for me. But there must have been an update to CrashPlan which now requires extra steps.

Mike Tabor has also written an equally thorough, easy-to-follow guide where he does explain all the now-required steps. Again, however, there is a pitfall.

So for this reason, my suggestion is to follow Mike Tabor's guide up to and including step 12. However, Mike refers to an important file, .ui_info, and this is where the pitfall lies.

.ui_info, you see, is a hidden file which may be in a different location depending upon how you've installed the CrashPlan client (which connects to the headless installation on the NAS). To access this file on your local computer, open Notepad++ or Notepad2 as an administrator, then point it towards the following path (because, at least on Windows, this is a hidden file, my suggestion is to copy/paste this path straight into the "Open…" dialog of your chosen text editor):

  • Windows Vista, 7, 8, 10, Server 2008, and Server 2012
    • Installed for everyone: C:\ProgramData\CrashPlan\.ui_info
    • Installed per user: C:\Users\<username>\AppData\<Local|Roaming>\CrashPlan\.ui_info
  • Windows XP
    • Installed for everyone: C:\Documents and Settings\All Users\Application Data\CrashPlan\.ui_info
    • Installed per user:C:\Documents and Settings\<username>\Application Data\CrashPlan\.ui_info
  • OS X:
    • Installed for everyone: /Library/Application Support/CrashPlan/.ui_info
    • Installed per user: ~/Library/Application Support/CrashPlan/.ui_info
  • Linux:
    • /var/lib/crashplan/.ui_info
  • Solaris:
    • /var/lib/crashplan/.ui_info

That list of paths has been lifted directly from Code 42's own headless guide (which, alas, does not cover the Synology installation whereas Scott's and Mike's guides do).

Again, Mike Tabor's guide tells you what to do with this file in step 13 of his guide.

So that's it. No additional screenshots, not even any additional steps. The simple pitfall is that the important file, .ui_info, is a hidden file and may be in a different location.

Be sure to read each step in Mike's guide very carefully, there are several detailed steps which must be carried out in a specific order.

I'll also add that you may have to do this .ui_info step more than once - since going through this process 5 days ago, I've had to repeat it because I've found that the long ID number has since changed.

UPDATE...

Having now gone through this process on a Mac, there are a couple of extra notes:

CrashPlan's official guide on the above file locations doesn't bear out; both the .ui_info and the ui.properties files - the latter for me is called ui_andrew.properties as it's installed per user - are found on a Mac at

~/Library/Application Support/CrashPlan/

Furthermore, both files are hidden files. Unlike on Windows, where selecting to view hidden files is trivial, here are the steps required to view hidden files on a Mac:

  1. Hit <cmd> (⌘) + <space> to bring up Spotlight, then type "terminal" (without the quotes).
  2. In the terminal, type or paste "defaults write com.apple.finder AppleShowAllFiles YES" (without the quotes) and then hit <Enter>.
  3. Hold the <alt> key (⌥) and right click on the Finder icon in the dock and click Relaunch.

Any Finder windows will momentarily close and re-open, with hidden files showing. You may also notice some new icons on your desktop.

You'll probably want to hide these files once finished with the CrashPlan setup process, so simply follow the above steps with NO in place of YES at the end of command in step 2.