Full backup only deployments

enis:

We keep the WALs which can accumulate a lot if the use case is to only do
backups infrequently. This will definitely cause issues since HDFS space
will get filled up. That is why we may need an option for having
incremental backups not used, and WAL references being deleted.

In deployments with infrequent full backups only, there is no need to keep WAL files in archive for incremental backups.