using pgbackrest in a PG streaming replication cfg with repmgr

Hi List,

We have a requirement to start using pgbackrest for db backups on slave PG hosts already configured in Streaming Replication . To avoid any issues with WAL files transfer and performance in existing PG streaming replication configuration , we plan to run pgbackrest only at a slave host and only full database backups ( no need for PITR/incremental when already have synchronous replication) . My questions are :

-How do I cfg pgbackrest to not archive/use WAL files without affecting the synchronous streaming replication?

- Are any known issues with pgbackrest + repmgr when running : repmgr standby switchover ?( to promote a new db master while slave is online ) or repmgr promote ?

thank you !!!