Seems you have it perfect. Internal is def better compatible with more games.
really its just a matter of using a 2tb drive and being able to easily transport that drive. Say you want to bring your games to a friends house without bringing your entire PS3 (assuming he has a backup loader option on his PS3 as well of course).
I use an external drive for most of my backups. Thats mainly because I had a 1TB external around and didnt have a larger internal handy.
However, its no problem to just use both. Internal for the larger games and External for the smaller ones. Backup managers like Gaia read from both at the same time and throw up all games from both drives in the same game list.
So its really just a matter of preference and if you own several of the games that can not be backed up to external.
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