Backups Using A PC:

If you have a Blu-Ray drive that supports PS3 games, you can rip a Blu-Ray disc by putting it into your PC,
browsing to the disc's location, and dragging all of the files into a new folder for your game.
If your PC only displays images in the disc's directory, it is not a supported Blu-Ray drive.
From there, you can play the game in folder layout, or create an ISO out of the files using GenPS3ISO GUI, which is bundled with AldosTools.
It's recommended to delete the PS3_UPDATE folder from the backup.
It will reduce the total file size and prevents the game from prompting you for an update if you are on a lower firmware version.

[Aldos PS3 tools Download]

To Play the Backups:

Copy the PS3 game rip files in a folder to the GAMES folder on the root of your PS3's hdd_0
To get all the free psx/ps2 games go here: http://www.theisozone.com/downloads/playstation/psx-isos/
To play them on your ps3 copy the isos to the respective PSXISO and PS2ISO folders on the root of your PS3's hdd_0
Note: you will need webman to play the games