Odd behavior of backspace in Vim (SSH to Linux from Mac)

Question

I didn't change any setting of my Vim, but today the Backspace gets some crazy behavior. Every time when I hit it, it does not delete a character, but prints ^?. Anyone knows what is going on?

Answer 1

Not sure why it would randomly start doing this based on the information you gave, but trying adding this line to your .vimrc

set backspace=start,eol,indent

Answer 2

The problem comes from the communication between Mac Terminal the Linux Terminal.

Go to the Mac Terminal -> Preferences -> Advanced tab, check the option "Delete sends Ctrl-H". Then after I login to Linux, and Backspace works just fine in Vim.