It will be great if i can backup my thunderbirds settings/emails (send to cloud like dropbox/onedrive/etc) and restore it with one simple "click" on other machine/reinstaled system. If i can restore deleted emails (accidential deleted even from bin trash) it will be great too. Bookmarks backup from browser is option (yep a few aplication can do that) but if i can simply backup bookmarks from opera to cloud, then restore to other machine or system it will be nice too.
PS Sorry for my english ;)) Hope you understand me.