Solutions:
1. Local backup please confirm whether the SD card space is enough, and then try to replace the SD card.
2. Whether the storage space of the fuselage is enough; if the storage space is insufficient, the backup may not succeed (the backup needs the remaining space, which is larger than the size of the backup data, it is recommended to reserve storage space, because the system needs to reserve part of the space to ensure normal use).
3. If the backup fails, please skip the section where the backup fails to occur to see if the backup can succeed;It is recommended to skip the backup if possible because of the program itself.
4. Update to the latest system and try again.
5. In order to protect data security, it is suggested to use MI Cloud service to back up data.
