I have Thunderbird as my default email application with three email accounts assigned: two of them are from local IPs and one is for Outlook. I would like to make a backup copy of all my emails (for just-in-case reasons) and upon openning of Profile folder, I have five folders in total: three of them are in this kind of format "hjhf7zdj.default.release" (numbers and letters are different from these, of course) and the rest two are in format "iughbc65.default". Do I have to make backup of all of them or not? Also, if I ever want to reinstall Thunderbird, do I have to simply copy-paste these folder over some newly created? TIA