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A PeerTube instance can mirror other PeerTube videos to improve bandwidth use.
The instance administrator can choose between multiple redundancy strategies (cache trending videos or recently uploaded videos etc.), set their maximum size and the minimum duplication lifetime. Then, they choose the instances they want to cache in Manage follows -> Following admin table.
Videos are kept in the cache for at least min_lifetime, and then evicted when the cache is full.
From the documentation:
A PeerTube instance can mirror other PeerTube videos to improve bandwidth use.
The instance administrator can choose between multiple redundancy strategies (cache trending videos or recently uploaded videos etc.), set their maximum size and the minimum duplication lifetime. Then, they choose the instances they want to cache in Manage follows -> Following admin table.
Videos are kept in the cache for at least min_lifetime, and then evicted when the cache is full.