Hi P. Yes sometimes we do learn the hard way unfortunately. Every time I add a profile or update any data and sources in that profile, I also do the same on a spreadsheet in Ms Office, it's like doing it twice, but if anything happens then you have all your research backed up for safe keeping. I also back up my spreadsheet to an external device, should something go wrong with my PC. then I still have the info. A lot of hard work goes into research and can be blown away in a matter of seconds! Actually I do it 3 times, cause I also print everything out and keep it in sleeved arch lever files.
As for your other question about remarks and explanation, You create a heading just above your Sources,
under this heading is where you do all your explaining.
The Sources are stand alone and always the last thing displayed eg.