by Darren Dickson.
I get this same error message when I try to use the x2 function to copy an activity or label (which seems really bizar, coz I don't know what that has to do with backup).
I previously had a similar problem with an error message that said that the backup_ids_temp already exists when I tried to run a backup. On deleting the temp file, my back up works, but I have the ne problem outlined above.
Have checked permissions and they seem to be fine.