Trying to make a new back failed

[wangchong01]

In fact, I think there must be something wrong with the backup system. My calculator often fails to backup and leaves me a backup 0.03kB, so I have to backup my programs to the computer or another calculator. Some of my backups sometimes even disappears when I finish a large backup(maybe 1MB or more). They may also reappear when I delete the large backup.
I'm now saving my programs to the computer. However, to my disappointment, some of my apps can't be transported to my calculator again! The calculator will restart just after I transport it with the connectivity kit. Now I even don't have a save way to safe my programs!