Column-oriented databases virtually all feature this in the form of column compression (e.g. "repeat this value for the next 1000 rows"). And if you don't want column compression, they have sparse data filling/interpolation -- e.g. use the last available value from a time series. This is pretty much their bread and butter. Interpolation is essentially making the query engine smarter, so you don't end up in the situation you're apparently facing where you have to insert duplicate records purely to satisfy a simplistic join.
Back to this product (which appears to simply wholesale copy databases?), I use LVM for exactly what it is doing -- I create and rollback and access and update LVM snapshots of databases. The snapshots are instant, and in most situations the data duplications is very limited. LVM is one of the coolest, most under-appreciated facets of most Linux installs -- http://goo.gl/J2mIvG
Back to this product (which appears to simply wholesale copy databases?), I use LVM for exactly what it is doing -- I create and rollback and access and update LVM snapshots of databases. The snapshots are instant, and in most situations the data duplications is very limited. LVM is one of the coolest, most under-appreciated facets of most Linux installs -- http://goo.gl/J2mIvG