ER: When syncing create a backup of file being overwritten

[GoogleCodeExporter]

Enhancement Request:

Often times it is be useful to keep older copies around. 

o Perhaps that is an option that can be included and set by default. 
o Perhaps the extension used in the backup file could be configured to include 
variable substitution - such that by looking at the backups, one might 
understand who on what machine caused the backup.

Original issue reported on code.google.com by [email protected] on 14 Jun 2013 at 6:14