Back up your whole library, every song and playlist, to a single Backup.html file. On iPhone, iPad, and Android, open Settings and choose Backup. On Mac, choose iReal Pro > Backup; on Windows, File > Backup.
Then email the file to yourself or save it to Dropbox, Google Drive, iCloud Files, or OneDrive. Do it regularly, in case a device is lost or reset.
For more, see Back up and restore your library on the iReal Pro website.