You should generally use the respective “Image” for every partition that gives you that option.
Image will create a direct one-to-one copy of the underlying block-device.
TWRP typically doesn’t include backup-options for all possible partitions.
I have included the ones that are most likely to be modified when the device is rooted.
I have also included some partitions that contain device-specific information such as IMEI (EFS).
It is probably a good idea to backup EFS once and store it somewhere safe, but you typically should not restore it every time.
For a normal ROM Backup/Restore cycle the following partitions should suffice:
- Boot
- System Image
- Vendor Image
- Data
There is a full stock dump available here:
Installable ZIPs for restoring stock is available here: