If you use the website
LOAD button to run a patch then yes, it will only be temporarily stored. This is useful for testing out patches.
We've recently added a
STORE button which will save the patch to FLASH memory.
Note that if you want to save a patch to slot 1, it will become the default patch when the device starts up, so make sure the patch works first!
How many you can save depends on how big they are, but a minimum of 10 will fit. If you run out of space, use the new Device Page to erase the storage.