DeFi Saver is fully compatible with Maker's own Oasis app.
Any Vaults created using Oasis will be fully accessible and manageable at DeFi Saver, and vice versa, any Vaults created using DeFi Saver will be recognized by Oasis just the same.
This is possible because we stick to using the standard MakerDAO DSProxy architecture within DeFi Saver.
You can freely alternate between using DeFi Saver and Oasis at any time.
On the other hand, any MakerDAO Vaults created using InstaDapp are unfortunately not accessible or manageable using DeFi Saver. This is because InstaDapp uses a proprietary proxy wallet of their own, both in case of the older InstaDapp and their newer DSA architecture.