Moving an image

[forty2]

I got a new external drive the other day and wanted to copy the existing images of my two internals from an older external to the new one, and have SD update both sets of images (paranoid, nuh?). I tried to trick it, I suppose, by creating new backups and pointing to the copied and renamed images (the names were grayed but if I clicked them the save dialog would pick up the names). This all seemed to be acceptable to SD, but the backups to the copied images failed with errors relating to permissions (this is on my home machine and I am at work right now so I don't have the log). So I had to let SD make new images on the new drive.

For future reference is there a means to move an image and get SD to deal with it? The UI is a little opaque on such things.

This leads to another related question: how do I reuse an image? It seems that in order to make any preference changes (such as sleep after copy) I need to recreate the backup. Or am I wrong there? I can't seem to change a backup after the fact.