[Duplicity-talk] Remove a file from backups

[Grant]

I recently realized that one of the files on my system contains
sensitive information in plain text.  I've now encrypted the file with
a password but it has been included in my duplicity archives in
unencrypted form.  Can I remove the unencrypted file from all of my
duplicity archives?  If not, is deleting all of the old archives and
running a fresh, full backup the right solution?  Since I create
backups unattended, I don't use a password to encrypt them.

- Grant