Seatbelt offers three basic verification modes:
Source & Destination
Every file is hashed at the source, copied, then hashed again at the destination. If the two checksums match, the file is confirmed good. If they don’t, Seatbelt flags it immediately. This is the only mode that supports ASC MHL manifests.
Source Only
For managing multiple backups from a single source, we check the source against itself during and after transfer. If a drive is about to go bad, or read errors appear - you can catch it in time.
Transfer Only
Sometimes you just want a simple transfer. This mode compares file sizes and date stamps. Simple and fast.