Here's what I use for moving content from internal to usb0.
You can leave this .ini as it is and it will only move to ext. any new stuff it finds installed to internal when you run the App2USB payload.
It is setup so everything should get dumped to external; updates, dlc the lot.
To check the usb root for the pkg file to save time copying from the internal ps4 drive then uncomment the line below.
but remember this will move the pkg from the root directory to the PS4 folder.
CHECK_USB
To rename previously linked pkg files to the new format uncomment the line below.
//RENAME_APP
To disable the processing of icons/art and sound uncomment the line below.
//DISABLE_META
To leave game updates on the internal drive uncomment the line below.
//IGNORE_UPDATES
To move DLC to the usb hdd uncomment the line below.
MOVE_DLC
To use this list as a list of games you want to move not ignore then uncomment the line below.
//MODE_MOVE
Example ignore or move usage.
--------------------- MERGED ---------------------------
You can ignore the below if you only plan on using one external drive but...
For sake of completeness, you can utilise multiple external exfat drives in conjunction with App2USB in case you start running out of room on your first one (up to 3x8Tb on a Pro)
with a few of caveats:
https://gbatemp.net/threads/using-2-hdds-with-app2usb.506341/
and
https://gbatemp.net/threads/payload-building.506460/
have the details.
What is important if you go this route eventually is:
a) ensure you can guarantee on booting up the PS4 which drive will be allocated to which mount point.
In my case, I use a 5TB Seagate and an 8Tb WD MyBook and perhaps due to the spin up speeds, the 8TB is always mapped to usb1 so I'm good there.
b) You will need to use a modified App2USB payload in order for it to operate against the correct mount. The regular stooged one only recognised usb0.
@jakkal provided a recompiled one for operation against USB1 on one of the threads.
c) You will need to utilise the MODE_MOVE option on the App2USB.ini on your second (usb1) drive. Otherwise, logic would suggest that everything already installed to internal would get recopied to your fresh new drive.
So the only mod to the .ini you need from the above is when installing new stuff to internal that you want transferred to usb1, uncomment MODE_MOVE and add the CUSA list of what you want moving underneath.