Developer-Dude
Hello! All sorts of quirks can arise when restoring from a backup process for the first time, which can be a luxury to do. Luckily you still have your 6a. Some people find out their dozens of backups are unusable and lost all of their data or have some missing like the specific dates.
I would first check the modification dates of your backed up pictures which I assume are on your computer.
Ls -la or view the properties.
(When I say delete your 9a pictures, backup any new photos, screenshots, etc)
If the dates are all the same on your backuo, create a new backup from your 6a. Then delete the pictures on the 9a, and copy again to the 9a.
If they are different dates on your backup, delete the pictures on the 9a, and copy to the 9a
Phones will probably respect Linux tools preserving the modification date.
Practice using rsync inside of /dev/shm/
use mkdir and touch. Until you get familiar with it.
Make a 2nd backup of your backup while you use rsync on your backup. In case things go wrong.
For example, (change this to the right file paths)
Copy from 6a to your back up
rsync -avP /media/old6a/ ~/mybackup/
Copy from the backup to your 9a
rsync -avP ~/mybackup/ /media/phone9a/
"a" preserves the owner, group, modification time, and copies all folders and files.
v, verbose. More info
P, shows the progress
warning
always use a trailing slash unless you understand what removing it entails. You can have surprising results if you didnt know the difference.
Good: /home/johnny/
Bad: /home/johnny
Some Linux GUIs will preserve the modification date when copying, some set the modification date for all files to right now.