RocksDB has its own way of doing backups, so we didn't plan to support backups from MongoDB API at this time (http://blog.parse.com/learn/engineering/strata-open-source-library-for-efficient-mongodb-backups/). However, currently a storage engine without backup support fails a lot of tests. An example: https://logkeeper.mongodb.org/build/560bf35e90413021b19a2209/test/560bf3a2be07c4135f9a2607

Can we skip all the tests that depend on backup functionality if the storage engine doesn't implement it?