It depends. Metadata is always redundant with 2 copies (even when using copies=1). So if the file's metadata is corrupted, yes ZFS will fully recover and rewrite a 2nd good copy of the metadata. But if the data is corrupted, then ZFS can do nothing to recover (you may be able to partially read the file, but the rest of it will return I/O errors.)
Ok, so zfs for single drive users doesn't fix single data corruption.
Definitely I'm going to use my solution so. All the next generation FS stuff is cool (btrfs also indeed) but for the simplest use case people just need safe data and fix it it the disk goes bad.
