The preview in 5.1.2 is still seriously flawed, so I will continue to use 4.2. You still cannot compare files in the preview panel to determine WHY the files are different.

The information present in Synk 4 (owner, file size, modified date) goes a long way in allowing the user to determine if the right backup is being performed. Imagine the situation where you deleted all the text from a document. Synk 5.1.2 would take this as a modification and overwrite your backup copy without you ever knowing about it (until it was too late). Until this is changed, I will continue to use Synk 4.