Re: backup method

[Luc Teirlinck]

In my original reply, I forgot that you actually set TMP and TMPDIR
and did not customize `temporary-file-directory' itself.  I still
believe that to get the portability you want, the user should be able
to correct wrong guesses we made about his operating system defaults.
To achieve this and to unlink the two unrelated problems of whether
the user needs a backup in case he might regret his changes and
whether processes need to use the edited version or not, I still
believe it is best to make `normal-backup-enable-predicate' use a
customizable list of directories in which no backups should be made.
Also, as I already said in my earlier reply, maybe a customizable
variable `backup-by-copying-directories' might be useful.

Sincerely,

Luc.