188.8.131.52 Single or Numbered Backups
If you choose to have a single backup file (the default), the backup
file's name is constructed by appending `~' to the file name being
edited; thus, the backup file for `eval.c' is `eval.c~'.
If you choose to have a series of numbered backup files, backup file
names are made by appending `.~', the number, and another `~' to the
original file name. Thus, the backup files of `eval.c' would be called
`eval.c.~1~', `eval.c.~2~', and so on, through names like
`eval.c.~259~' and beyond.
If protection stops you from writing backup files under the usual
names, the backup file is written as `%backup%~' in your home directory.
Only one such file can exist, so only the most recently made backup is
The choice of single backup or numbered backups is controlled by the
variable `version-control'. Its possible values are:
Make numbered backups.
Make numbered backups for files that have numbered backups already.
Otherwise, make single backups.
Never make numbered backups; always make single backups.
`version-control' may be set locally in an individual buffer to control
the making of backups for that buffer's file. For example, Rmail mode
locally sets `version-control' to `never' to make sure that there is
only one backup for an Rmail file. Note: Locals.
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