Around two years ago Thunderbird crapped out on me and deleted all my archives. I've also lost emails when moving large (O(10^3)) IMAP folders. Not sure how mu

Around two years ago Thunderbird crapped out on me and deleted all my archives. I've also lost emails when moving large (O(10^3)) IMAP folders. Not sure how much work has been done on Thunderbird but I do an IMAP backup before archiving or making structural changes. I should probably have an automated download for backup purposes set up ...