
In a recent update on Bungie’s community forum, they have stated that the old archive of Halo stats, save files, and other stats hosted at halo.bungie.net (visit while the link works) will be permanently going offline on 9 of February this year.
The website had hosted player save files, stats, and other data from previous Halo games such as Halo 2, Halo 3, Halo 3: ODST, and Halo: Reach for over nine years.

Bungie has advised the users to save the files however they can before the due date.
According to Bungie, the important data such as Groups, Forums, and News Articles have already been imported to Bungie.net in 2013.