Wait a sec ... the version you are running already has code in it to check this situation. I just ran the same scenario and got an appropriate error message (not a traceback). The permissions on your rdiff-backup-data are not what I expect.
What are the permissions?
$ ls -la terabyte/rdiff-backup/rdiff-backup-data/
Wait a sec ... the version you are running already has code in it to check this situation. I just ran the same scenario and got an appropriate error message (not a traceback). The permissions on your rdiff-backup-data are not what I expect.
What are the permissions?
$ ls -la terabyte/ rdiff-backup/ rdiff-backup- data/