The suggested approach to backup Basecamp projects is to set up a one-way sync to an empty Dropbox folder.

cloudHQ will copy Basecamp to Dropbox and create a folder for each Basecamp sections (i.e., messages, to-dos, etc.).

Here are instructions for how to back up Basecamp to Dropbox:

1. Start synchronization wizard to sync two cloud accounts:
2. Click the Basecamp icon:
   
3. Select one of the already-configured Basecamp accounts or click “Add Basecamp” to add new Basecamp account:
   
4. If you click “Add Basecamp,” you will be forwarded to authorize cloudHQ to access your account:
   
5. Select the option to sync all projects, files and messages in your Basecamp account or choose which projects you want to sync, then click “Next Step”:
   
6. Click the Dropbox icon:
   
7. Select one of the already-configured Dropbox accounts or click “Add Dropbox” to add new Dropbox account:
   
8. If you click “Add Dropbox,” you will be forwarded to authorize cloudHQ to access the account:
   
9. Select what to sync for Dropbox and click “Next”:
   
10. Choose any existing Dropbox folder or click “Create Folder” to create a new one:
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11. Select the Dropbox folder you want to sync, then click “Select Folder”:
    
12. Click “Switch to One-Way”:
    
13. Once you’ve chosen your options, synchronization starts automatically:
    
14. The synchronization status will display after initial synchronization.
15. Once synchronization has started, here is How to Monitor Status of Sync.
16. You will receive an email to confirm the success of your initial synchronization.