Method To Identify backups that can be put on ext HDD
Problem : You want to backup a game to your external HDD but you don't know if there is a single file >4GB until the backup manager tells you and then you get an fwrite error = a waste of time (and it is slooooow) so its trial and error. Yes I know you could refer to here first but i have found the following method to be pretty good. (and much faster)
My Solution : backup your game to the internal HDD then use the ftp app to copy it to your PC then download searchmyfiles from here or here its a freeware app. Run searchmyfiles and change the options to the following :
just change the base folder to where you ftp'd your backup to, for example : [drive letter ie D]:\PS3\Gamez as shown in the capture and tick file size at least, change that to 4GB and start search, this will instantly show you any files within the specified folder that are over 4GB like this :
if you get a hit (single file >4GB) then just leave the backup on your ps3 int HDD (which you have already done), if none of the files are >4GB you can easily and quickly copy it over to your ext FAT32 HDD as you now have it on your pc and then delete the one on your int HDD
I have done this with 8 games now and even with an ftp speed of approx. 10Mb/s its much faster than trying to copy to my ext drive then finding out that there is a file over 4GB meaning I have to start the backup process from the beginning.
I hope you found this useful :)