I believe if you would poll those experienced in doing genealogical
research you would find that most recommend maintaining your principal
database on your personal computer. There are several programs that
will allow you to sync you computer with an online tree. (If you don't
have a personal computer on a thumb drive.) This will give you maximum
control of changes and access to your data.
If you have your information piecemeal in various sites you will loose
track of where you have what information.
Personally I like to have all of my data on my laptop. In this way
wherever I go, and what ever conditions I find, I can always check my data.
In the past I have used my database in many places; from the home of a
distant cousin in the mountains of Kentucky away from any possible
internet connections, to cemeteries in various locations where I need to
check my data to verify the the grave I was looking at was the person I
thought it was.