CardSync - Verified Copy

CardSync copies one folder to another and verifies every file it writes. Memory card, SSD or USB-C stick, iCloud Drive, the iPhone itself: anything the Files app exposes works, in both directions. The source can also be an album from your photo library, and the destination a server: S3 or SFTP, your own. The Files app can already move files. It cannot tell you whether the copy is faithful, what is still missing, or resume where it stopped. That is what CardSync does. VERIFICATION After each write, CardSync makes the system forget what it holds of the file, reads the copy back from the destination drive and compares its SHA-256 digest with the original's. The original is read again too, from the card: if the two reads differ, the card reader is at fault, and the app tells you instead of keeping corrupted data (can be turned off). ONLY WHAT IS MISSING Both sides are analysed before…