1. If the file is damaged by a corrupted hard disk, then "Compare by File time and size" will not determine whether the file is damaged?
2. Is it better to use "Compare by File content" for damaged files?
If the file is damaged…?
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1. Correct.
(Of course unless the date/time changed - which may not be the case.)
2. I would think, that would be the way to go.
Do note, that it is you that still needs to determine if you should actually back up a particular file or not.
If content does not compare, FFS will want to back up the file.
If the file changed - because the file changed, & you understand why it changed, then in that respect it should be fine to backup.
If the file changed - because of "disk damage", then in that case, your existing backed up file would be the version you want to keep - not the "damaged" version. By the same token, you kind of need to have some method to verify why a particular file changed.
Like if it is a book you are writing, & you added a new chapter, then sure, back it up, replacing the older.
If it is a book you are writing, & you added a new chapter, yet when you look at earlier chapters, you see they are out of order or have some random data in there, then most likely the file is corrupt, & your older backup would be the version you'd want to hold on to.
You can use versioning...
https://freefilesync.org/manual.php?topic=versioning
(Of course unless the date/time changed - which may not be the case.)
2. I would think, that would be the way to go.
Do note, that it is you that still needs to determine if you should actually back up a particular file or not.
If content does not compare, FFS will want to back up the file.
If the file changed - because the file changed, & you understand why it changed, then in that respect it should be fine to backup.
If the file changed - because of "disk damage", then in that case, your existing backed up file would be the version you want to keep - not the "damaged" version. By the same token, you kind of need to have some method to verify why a particular file changed.
Like if it is a book you are writing, & you added a new chapter, then sure, back it up, replacing the older.
If it is a book you are writing, & you added a new chapter, yet when you look at earlier chapters, you see they are out of order or have some random data in there, then most likely the file is corrupt, & your older backup would be the version you'd want to hold on to.
You can use versioning...
https://freefilesync.org/manual.php?topic=versioning
