Company website server bandwidth suddenly increased for help

My company's website server bandwidth suddenly increased. for help, my company's server bandwidth suddenly increased recently. the server load is not very high, and the cpu and memory are not high. why is the bandwidth High? could you help me with the analysis! Is there a program problem!

Reply to discussion (solution)

90% is too many images, too large

Image leeching, gzip compressed output, http 304, etc.

Large Files
Leeching
Virus in

First, the server load is not high, and the cpu and memory are not high,
The server operation is not very high or normal.
Second, high bandwidth,
The server traffic should be high,
Conclusion: non-computing resources on the server have a high access volume, such as static pages (your data is being collected), image leeching (your images are leeching), and so on.