You probably know this already, strfry supports one-way and two-way sync setup very easily. Use it to keep all @Nostria discovery (indexing) relays in sync, and I sync with your index relay, purple pages and a couple of popular regular relays with one-way sync.

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Yep, I use it to sync my indexer with a few others. Outbox model is somewhat more complex though, replicatr is intended to help fix missing note parents and stuff like that (although I can't help wondering if it's a band-aid solution).