POCKET TI FULL DOCUMENTATION.
1. Pocket TI versions.

Pocket TI Uses 16384 bytes of space.
Apps: Notes, Calc, Share, PRGM.
Games: GTN.
Has a native TI84 version.
Runs off of a app with all dependencies included.

Pocket TI also has a non app edition, which is intended to be lighter.
It fits in 4096 bytes, with ZRUN included.
The help function is not included.

There is also a Embedded version, which is for testing and debugging or as a fallback in case Pocket TI fails. It fits in just 310 bytes.
It only comes with Notes, Share, and Calc. It is based off of Pocket TI 0.10.

2. Data storing.

Data storing isn't used in TI Pocket Embedded.
Pocket TI stores all of it's data in a list called PTI, which is stored in RAM. There is a backup list called PTIB, which is stored in Archive.
This list contains data such as; The version being run, if the user shut down correctly (value is 0 if they shut down correctly, 1 if not), and the calculator being used.

3. Updates.
Pocket TI is consistently updated for bug fixes, new features, and optimizations. However, updating your installation every few weeks can be annoying, espeically if you're borrowing a transfer cable from a friend.
So, LTS versions are avalible for these people. LTS versions are extensively tested for bugs and are packed with the best apps. LTS versions are released roughly every year.