Is it possible to ensure that at least one snapshot is kept from each individual host, or tag? I have several machines backing up to the same repository and although it’s unlikely any given machine will not back up for long enough to trigger a pruning of ALL of its data, it’s theoretically possible. Just wondering. Thanks! 
restic forget with policy-based keep flags will refuse to delete all snapshots in a single group. How snapshots are grouped is controlled by the --group-by flag. So, e.g., --group-by host will refuse to delete all snapshots of any particular host.
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Ahhh okay, thanks a lot!
I just found that in the documentation. It says:
When
forgetis run with a policy, restic loads the list of all snapshots, then groups these by host name and list of directories. The grouping options can be set with--group-by, to only group snapshots by paths and tags use--group-by paths,tags. The policy is then applied to each group of snapshots separately. This is a safety feature.
Does that mean it groups by host by default and I don’t need to specify anything if that’s what I want to happen?
restic help forget documents the default:
-g, --group-by string string for grouping snapshots by host,paths,tags (default "host,paths")
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