I also do what BeachKitten does - keep a running dairy of cut and paste info from topics that I want to keep
I date and note who posted and then collect under various topics
ie beaches, accomodation resto Dutch etc
Dating the comments lets me periodically search and delete older comments- I started this practice in 2011, since then have pruned the older posts I've kept
Also after we return I update if we went there, ate there etc
J&B