Jetpack: WordPress official plugin, free CDN, daily automatic backup, downtime monitoring, automatic spam filtering

Jetpack is a plug-in officially developed by WordPress and provided by WordPress. It has free and paid versions, and the prices are relatively reasonable. All versions offer unlimited static file hosting and unlimited image hosting. The personal version only costs $3.5 per month and provides daily automatic backup, 30-day backup archive, and automatic spam filtering; the premium version costs $9 per month and adds automatic malware scanning, automatic security repair, and unlimited video hosting.

Official website : https://zh-cn.jetpack.com/pricing/

You can install plug-ins directly in the WordPress backend, and then associate them with your wordpress.com account for settings, purchases, etc.

Static file CDN is: i0.wp.com, i1.wp.com, i2.wp.com or i3.wp.com