As many people mentioned backups before, I would only add this: Maybe check -in your favourite search engine- if the very same model of computer that you use doesn't have know quirks (hardware needing some tweaking, not being fully recognized, etc.) with gnu/linux, like for instance searching "$model linux" or "$model $distro" (with the distros you plan on trying, etc.
Also maybe if you connect only via Wifi, check that wifi chip for compatibility first, and maybe get as a backup a USB wifi dongle that is know to work on gnu/linux... juuuust in case ;)
<3