The two most important things to save are data and personal irreplaceable items.

Data is easily saved by uploading to cloud storage, preferably more than one service. You should already be doing this, Google Drive is 15GB free, Dropbox is 2GB free. Usually that's enough for the most important documents. Google Photos has unlimited storage as long as your pictures are 16MP or less.

I'll admit that I don't have an overview of my irreplaceable items. Maybe I should do a mental list when I get home today.