Time Machine won't restore Mail
Like a crazy man I delete my Mail Spam and Trash regularly. Today, by accident I highlighted all the mail in my Apple Mail inbox and deleted it and then deleted the trash - it's gone.
Feeling somewhat relaxed, I went to my Time Machine with Mail open and accessed Time Machine. But nothing, the restore is greyed out. There are backups available in Time Machine but even as I click on old backups e.g. an hour before I deleted everything, nothing changes.
The email account in question is my work GMAIL account that I access using Apple Mail. GMAIL reflects my Apple Mail inbox - the mail is gone there too.
At this point it feels like Time Machine is a huge failure. Any suggestions?
MacBook Pro 13″, macOS 10.15