We’ve updated the minimum FDB version required for encrypted backup support from 7.3.72 to 7.3.73 in the 7.3.x line. The 7.4.x line remains unchanged at
7.4.6.
This change is due to a bug in FDB 7.3.72 (apple/foundationdb#12544) where running fdbbackup modify on an encrypted backup would strip the encryption from the backup data. The fix for this bug was introduced in 7.3.73.
PR: https://github.com/FoundationDB/fdb-kubernetes-operator/pull/2441