I got a lesson the hard-way. Mendeley crashed and refused to start up again. There was a known bug that they had not fixed for months. Almost a year of annotations gone. Even though I could find the PDF on disk I could not get to my annotations. they store it in a sqlitedb. I needed to reverse engineer the sqlitedb to get anything out. Total nightmare.
Still searching for a better solution for annotations + referencing. I use zotero and the highlights app at the moment.
I use a standard PDF reader and then the ZotFile plugin. ZotFile processes highlighted text and comments made in PDF compliant ways and turns then into notes in Zotero.
Still searching for a better solution for annotations + referencing. I use zotero and the highlights app at the moment.