Problem:- How to add auto-save functionality in Sublime-Text?

Solution:-

Using auto-save package.

How to install this?
1)Open package Control in sublime (Ctrl+Shift+p)

2)Search and select install option 

3)Search auto-save and select it 

4)Enable auto-save

Press Command + Shift + P again and search for AutoSave. Here, there are 3 options:(select the one that you want to enable)

• Toggle AutoSave: all files
• Toggle AutoSave: current file only
• Toggle AutoSave Backup: current file only