Hi community,

if you are using Dell Data Domain and you are planning to upgrade to v12.1, be careful and read well the documentation, especially release notes (https://www.veeam.com/veeam_backup_12_1_release_notes_rn.pdf):

Dell Data Domain: the supported operating system version is 7.3 to 7.12. Upgrade to it, or the
backup jobs pointed to this repository will fail to start.

As @foggy explained to me in the R&D forum, “earlier versions are already End Of Support from the Dell side and 7.3 is required for Retention Lock support from the API perspective“

Enjoy!