Who is going to use your data? Do they know the format? Do they know how it was collected or generated? Can they reproduce it? Can they understand why it's useful? Is there a paper or other document they can use to understand things?
If someone has questions about the data, who do they contact? (I mention this because that's part of the broader sense of 'maintenance'.)
How big is the data? If it's 1K then you can store it just about anywhere. If it's 1TB then you are much more limited.
How long do you want the data to last? How important is it that it survives past your winning the $70 million jackpot tomorrow and deciding to retire on an internet-free atoll in the south Pacific?
In most cases I deal with, the answers are: 1) almost no one cares about the data until it's been published, 2) it's maybe a few MB, and 3) 5-10 years is fine.
If so, then github, bitbucket, etc. all work fine.
DataDryad is another, but it's specifically for data associated with journal publications: http://datadryad.org/