Repositories mostly fall into one of the following types:
The Registry of Open Access Repositories (ROAR) aims to promote the development of open access by providing information about the grown and status of repositories throughout the world.
OpenDOAR (the Open Directory of Open Access Repositories) creates an authoritative reference database of Open Access repositories worldwide.
Both of these two portals provide several filters including subject, repository type and content type (e.g. articles, theses, monographs, etc.).
OpenAIRE is an Open Access publications infrastructure, making visible funded research outcomes.
arXive.org is Open Access and has over 1.5 million e-prints in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.
In other words, differing funders' requirements and publishers' licensing contracts will inform the choice of PubMed repository (i.e. any embargo on deposit of full texts may mean that the PubMed abstract remit is more appropriate than PMCentral).
Research outputs need to be deposited in a subject or institutional repository; in the case of the University of the Highlands and Islands, this means PURE. Further guidance on how to use this repository can be found via the University's research information system pages.
An article must be deposited in PURE within three months of publication acceptance (as dated in an acceptance communication from the publisher).
The priority deposit for UHI researchers is always PURE. However, in order to increase exposure of research outputs, deposits can also be made in subject specific outputs (though researchers should always check with publishers and funders to ensure that licensing and funding agreements are not thereby infringed).