Warp sync snapshotting takes quite a lot of RAM. This may make OpenEthereum unusable on many otherwise fine configurations. More than that, snapshotting by laymen may be unnecessary because:
For public networks we maintain perfectly capable warp-sync-ready bootnodes.
For private networks it makes more sense to simply backup the database and restore the chain database to the nodes verbatim.
Oddly enough, you cannot specify flags to default to true. I've made a new --enable-snapshotting flag instead. This is a breaking change for those who used the old --no-periodic-snapshots flag.
Warp sync snapshotting takes quite a lot of RAM. This may make OpenEthereum unusable on many otherwise fine configurations. More than that, snapshotting by laymen may be unnecessary because: