Symptoms1. The error is reported when attempting to run backups in DS-USer.
2. The error is reported when replication is interrupted on DS-System side by backups.
Cause1. The DS-Client databases were migrated from one SQL Server instance to another and the recovery model has been changed from 'simple' to 'full'.
2. The behavior is expected, the message though for this scenario should be an information, not an error.
Workaround1. Change back to 'simple' the recovery model for DS-Client databases, see KB ... for details.
2. Message severity will be attempted to be adjusted through a code change in the future for this scenario.