Using recollindex update for backup files

I was starting with inotify to monitor changes in my directories and launch a backup script using rclone. So I thought that, taking advantage of the fact that I'm using Recoll in my debian, I could use the changes that Recoll detected to launch rclone, without having inotify working. I haven't been able to find in Recoll a clear log file that tells me the last files that have been modified or created, every time I update the index. I've been trying the recoll_status script, or trying to read xapiandb using xapian-delve, but without success. Any idea how to get a list of the last added or updated documents in the Recoll index?