Relative path to sublime_text.exe folder ?

I was hoping to see if there was a way to set the backup folder relative to ST's folder.

My backup folder is `_Backups Sublime Text`.

My folder structure is like so:
```
[.] [..] [Backups Sublime] changelog.txt crash_reporter.exe
[Data] msvcr100.dll [Packages] plugin_host.exe [Project Folder]
python3.3.zip python33.dll subl.exe sublime.py sublime_plugin.py
sublime_text.exe update_installer.exe [_Backups Sublime Text] [_Send to 3ds Max]
11 File(s) 27,999,524 bytes
8 Dir(s) 846,603,526,144 bytes free
```