I realize that and that's why I said that I should have been clearer ^^
Anyway, thank you both for your help.
If I update to OFW, I will loose the ability to run all homebrews, multiman, etc... That's not much of a problem since I don't touch most of them and getting newer games on the ps3 would be better than playing them on my PC that doesn't always handle them. And I could always get a flasher and downgrade if necessary.
However, will I still be able to delete game backups and homebrews once I update, or should I do that before upgrading?