Why are the text messages backed up by mobile phones before swiping them all after swiping them?

Did you use a titanium backup? It is very likely that you formatted the SD card and mobile phone memory when you brushed the computer. Generally, the backup software materials you use to collect are stored in your mobile phone. If you format them all, it is impossible to restore them. Next time, you'd better back it up to your computer with software like pea pods.