The Usage Reports page reports an Archived Volume measurement, but archiving to a NFS share has not been configured.
VMware Aria Operations for Logs 8.x
Archived Volume measures the amount of log data in buckets that have changed status from 'active' to 'archiving' to 'archived' when the buckets are sealed as part of the event lifecycle. This process happens for all buckets regardless of whether copying the archived buckets to a NFS share is configured.
Constantly increasing amount of Archived Volume regardless of NFS configuration is the designed behavior of Operations for Logs.
Note: If an Archive Location is configured for an Index Partition, the log data from each bucket will be transferred to the NFS share during the bucket's archiving stage.
Life Cycle of an Event (archiving happens at stage 6)