by K Robert
This flow backups the internal storage WhatsApp folder to the sd card. The location is . WhatsApp_Bck, change the variable that contains this folder to match your own). This folder must exists, so has to be created manually. The backup is created in an hidden (if you cannot find it in the archive use "display hidden files" option) folder named .WhatsApp_Bck to avoid duplicate photos in gallery. The backup is done at 20.45 three days in a week, change it if you want. You must have write rights to the SD card (on KitKat and above), or else the script will fail!