How to copy SMS to USB flash drive?

Smartphones can be backed up by software, and QQ Synchronization Assistant has this function. However, the backed-up materials (such as address book and information bookmarks) are stored in Tencent server and cannot be viewed. You can't see them until you download them to your mobile phone again. You can also find the information directory file and back it up to the U disk, but this file can't be opened. There seems to be no solution for domestic machines. Look at the short message and type it out on the computer word by word.