Although the PS Vita has since been dropped by Sony there is a lot of games and homebrew available if you have a vita and its on a firmware of 3.68 or lower.
By modding the device you can add cheaper storage using a micro sd card with a psvita adaptor, dump all your “Backup” games onto it to play and also as mentioned take advantage of homebrew applications such as emulators.
There’s a lot of guides kicking around online but the one that covers all and whats needed is here which I would highly recommend.
Here’s a snipping from the site of what’s needed to start:
- Before beginning the guide, you must know the risks of Vita hacking: EVERY time you modify your system, there is always the potential for an UNRECOVERABLE brick. They’re rare, but still a possibility so make sure you follow ALL directions EXACTLY.
- This guide will work on all PS Vita, PS Vita Slim, and PS TV devices in all regions on firmwares from 1.03 to 3.68
- If everything goes according to plan, you will lose no data and end up with everything that you started with (games, PSN Account, saves, etc will be preserved).
- Keep your device plugged in and charged throughout the entire process to avoid data loss or damage from an unexpected power-off!
- The PS Vita 2000 and PS TV models are essentially identical to the original PS Vita 1000 in terms of software. All steps which say “PS Vita” also apply to other models unless otherwise specified.
- If you have a PS Vita 1000, you must also have an official Sony memory card (of any size) to follow this guide. This restriction does not apply to the PS Vita 2000 or PS TV as those devices have a built-in memory card.