It should work if its an incremental one that uses restic from what I recall. I don’t know about normal remote backup retention offhand.
I found the one commit where retention is added but i think there was more.
Although looking now i feel like some code was lost or not merged now where it added the retention flags to the args to prune when it ran unless i missed somewhere when looking.
Basically if retention is there it should be running on daily cron when it does the backup popon these extra args with the retention values.