The ability to rollback is supported. However restoring the files to a previous version is not supported by the InstallAnywhere 2010.
However if you want to customize this ability, then, you can use rollback handlers. You can read about the rollback handlers in the InstallAnywhere 2010 user guide. Please remember that should you choose to implement custom rollback functionality, then you should not enable the new rollback functionality in IA 2010.
Engineering Manager, InstallAnywhere