[dnanian]

Right. Backup volumes will be in the Privacy tab, and things should work fine in 10.4.3 and later.

Restored volumes will have their state maintained too, so they should be enabled (or whatever state they're in at the time of restore). If restored with Disk Utility it might end up in the Privacy panel -- just drag it out, and all will be well.

I don't think they fixed all the various privacy panel issues with 10.4.2, but it's possible they did. Give it a try -- if the drive stays in Privacy, even across a reboot or disconnect/reconnect, without SD! involved -- it will work.