For how many days you are planning to go? I have been to Japan but planned my own itinerary for around 12 days. Probably i can let you know my self itinerary if yoh prefer to explore on your own
Share across various platforms, fb, insta, whatsapp etc. Key is keep writing good stuff along with quality pictures, you will be noticed automatically 😊
For phone photos, Google photos/Dropbox backups works just fine. For heavy duty files like RAW and big JPEGs, go for a reliable hard disk. To be doubly sure, make two backups on two separate hard disks. Someone told me "hard disk are like feathers", treat them with utmost care.