Snapshot backup 504 gatway timeout error

Dear support,

I read the support forum regarding this before I create this ticket. Screenshot for the error message: http://prntscr.com/edtb8j

I disable cloudflare and increase the php(7.0) setting to:
max_input_vars = 5000
max_execution_time = 300

However, it did not solve the 504 gatway timeout problem.

Please help

Regards,
Andy