ERV ERV helps you track health and wellness data on your own device without a first-party cloud account. What ERV supports today: weight training cardio stretching sauna and cold plunge light therapy supplements programs and unified routines body tracking Privacy and ownership model: ERV is local first. Sync is optional. Supported health payloads are encrypted before relay sync. ERV does not operate its own hosted health-data cloud. Android cloud backup and device transfer are disabled for app data; use ERV export / backup files when you want an off-device copy. Exported files are plaintext unless you encrypt them separately. Relay operators may still observe metadata such as timing and your public key. ERV can attempt to remove or replace synced relay data, but cannot guarantee every relay permanently deletes retained copies. Third-party remote signers, relays, and media hosts are outside ERV's control. Import / export wording: Data interchange is for AI, coach, and script workflows. ERV backup JSON is for migration, archival, and restore.