I have an interesting situation here. One of my users refuses to participate in the system of backups because she's concerned about the security of her files. She agreed to participate if I can make the system work such that even I am unable to see the contents of her files. She's running Windows -- XP Home, I believe.
A little Googling and some brainstorming leads me to consider three courses of action.
- Use a pre-dump command to encrypt the files before BackupPC reads her files. I've not used pre-dump commands before, so I'm not entirely sure how they work, but I imagine I could tell BackupPC to read only c:\foo, but, prior to doing that, run a script which takes the files in c:\my\sensitive\junk and creates an encrypted archive in c:\foo. I assume the pre-dump script would live in the cygwin environment, which is probably better for me anyway, since I don't know anything about Windows scripting. If this were a Linux system, I'd tar the files up and then pass the tar to gnupg, but I don't know if this is possible in a cygwin environment. Then, post-dump, I'd shred (or rm, if shred is unavailable) the temporary file in c:\foo.
- Some post I read somewhere suggested you could simply change your compression method or transfer method to a script that does the encryption before writing to disk. Nice thing about this idea is I can do all the configuration on the server. Does sound a little scary though!
- Use scheduled tasks (or whatever the Windows equivalent of cron is) to periodically create/delete encrypted archives, independent of BackupPC scheduling.
How would you do it? What encryption software would you use?
Cheers,
-Frank
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