You might want a Crypt14 viewer for three reasons:

"You think you’re safe in there," Elias muttered, eyeing the file on his PC. It was encrypted with AES-256, a digital fortress. But every fortress has a keyhole. Phase 1: Finding the Ghost in the Machine

Yes. Deleting older backups (the ones with dates in the filename) will not delete your current chats; it only removes old restore points, which can free up significant storage space. Final Verdict