Best practice for offsite PBS with only recent snapshots

[pizza]

What is the best practice for a offsite PBS to sync only the most recent snapshots.

For example:

- first PBS holds a month of snapshots (big disk)
- offsite PBS to sync only the most recent 3 snapshots (small disk).

Do I set in sync 'Transfer last' = 3 and 'prune job' = 5 latest?



Of transfer all and prune job = 3 latest?