Support
Where is my log stored?
On your phone. Might has no account and no cloud, so nobody can lock you out of your log. It also means nobody is holding a copy for you, which is why backups matter.
How do I back up my log?
On Home, tap your rank emblem at the top right to open You. Under Your data, tap Export backup. It makes one JSON file with every workout, routine and record, and opens the share sheet so you can save it to Files, iCloud Drive or anywhere else you choose. Progress photos are not in the backup.
To bring a backup back, for example on a new phone, tap Restore from backup in the same place. It shows what is in the file first, then replaces everything on that phone.
How do I turn off anonymous usage?
Open You, then under About, turn off Share anonymous usage. It takes effect right away. What those events contain is listed in the privacy policy.