Now maybe it may be only the all-in-one greatest plugin being coupled with ByeByeGenerator, Meta Robots, HeadTags, ScriptsDown and Meta Character Count as THE essential plugin for security, performance and SEO.
Not perfect with multilingual sites : no meta tags and issue with double sitemaps. You'll need to search for real second xml sitemap URL because clicking on second xml link leads to an empty sitemap : it keeps default (primary) language URL which is, of course, empty.
It miss language management. I copied it to assign one for primary language and the copy to second language but it doesn't work on all pages : it could only be assigned to module views so it doesn't work with articles and categories without menu.
Fortunately I installed it on a bad server where normal access to my database was impossible & normal scheduled backups were corrupted.
It saved me a lot of time moving the site on another host & locally.
It's a must have.
Now it could have a button to clearly choose between mail or hosted backup.