Before I read your systemd status log /home/suoni/Pictures was removed which confused me, I thought that the systemd trigger xdg-user-dirs-update.service would delete your pictures by itself after changing your XDG user config, but it’s not true, it just showed the warning message when your pictures were already gone ( by your accidental mistake or dangerous installed software without realizing it ? )
Unfortunately not.
This is a solution. If you said this backup is too old, you can change backup to daily incremental backup. (Plus an additional option: Create hourly snapshot with the ability “deduplication” that is pretty fast if you think your private data in home directory is more important than system and you edit or create your current pictures or data frequently per day)