I used to self-archive papers on my homepage in the institute where I was doing phd. I just noticed that my homepage and the reprints were removed -- that's normal, I'm not working in that institute anymore.
I can legally self-archive these papers. For example, J. Appl. Cryst. allows authors to post reprints
on their own personal website, on their employer's website/repository and on free public servers in their subject area.
What are the best "free public servers" to upload electronic reprints? (IIUC arXiv is for pre-prints rather than post-prints).