[ggpsv]

If you don't, can you expand on how you're doing this? Is it simply backing up the Thunderbird profile?

[LinuxBender]

I rsync the files in the directory that I specified Thunderbird should store all the folders and associated data. I restore it any time I rebuild my OS, also with rsync. That backup goes to a NAS which then gets backed up to multiple external SSD/NVME and one of those goes in my vehicle as a low-effort off-site backup.