Hi Guys,
There are some significant changes on Backup copy job from v10 to v11. Backup copy GFS retention was changed to match primary backup job GFS retention to enable support for many new V11 features requiring time-based GFS retention such as immutable backups. This article provide the reason why we have to change in v11, how it works and the checklist for upgrading from v10 to v11. It is highly recommended for you guys to spend some time on it!
https://www.veeam.com/blog/v11-gfs-retention.html