[hk__2]

There are free alternatives, like Peeep.us [1] and Archive.is.

[1]: http://www.peeep.us/

[2]: http://archive.is/

[alok-g]

From Peeep FAQ:

How long will Peeep keep my data?

Virtually forever. Nevertheless, we retain a right to remove content which has not been accessed for a month.

[RyanMcGreal]

Trust us to save your content, except for the stuff that is least likely to be saved anywhere else.