Issue No option "Keep backup files for"

[djovanov]

Hello,

I'm using Plesk Obsidian 18.0.30 and i configured backup manager to perfom a full backup. I woul'd like to automaticaly remove oldbackup but i have no option Keep backup files for in my Schedule page as indicated in How to set period of time after which Plesk backups are removed
I don't understand why...
Thank you in advance