Well spotted, I just migrated my file based on the latest version of the official Gladys documentation 
My DB is 7.1GB, it’s smaller, which must help with consumption. Gladys Plus backups are only 800MB, it’s effective!
My last one is 580MB 
Well, it’s clear, it froze my Gladys last night during backup 
So I just changed it to 11GB of RAM for the LXC and the stuck tasks have been resolved.
I really need to find out what’s wrong with me because it’s annoying to have to readjust the RAM like this.
By the way, no need to wait until nighttime, you can manually launch a backup to test if it works well during the day 
I had never thought of that to test 
Thanks for the tip!