RSM is no longer supported in June 2017 release. From 'Qlik Sense June 2017 release notes':
Repository Snapshot Manager tool removed
The automatic backup and restore tool Repository Snapshot Manager has been removed, as it was
intended for deployments using synchronized persistence. Please refer to the online help for manual
backup and restore procedures.
Please refer to 'Backing up and restoring' sections of our help site. We are currently working on a new tool for these processes - supporting shared persistence, and hoping to have it available within the next release. Stay tuned.
both RSM and the upcoming tool I mentioned in my initial response are build around the pg_dump and you are most welcome to use it when backing up and restoring your database. Our intention is to provide users with a tool that (liked RSM used to) with a single command line would allow to back up and restore entire Qlik Sense site, meaning installation of Qlik Sense and the database, handling certificates, shared and supporting content, etc.
from and including September 2017 release of Qlik Sense, all releases come with QlikSenseUtil tool located in %ProgramFiles%\Qlik\Sense\Repository\Util\QlikSenseUtil. There is also Readme.txt file included in the same location that described the usage of the tool for backing-up and restoring Qlik Sense.