Meaning of a message in Codeforces

Правка en1, от CSGO_is_life, 2016-09-01 11:12:08

The following message is appearing on all Codeforces pages:

We move the system to other data-center on September 1, 03:00-09:00 (UTC). It is possible that your submissions and other actions will be reverted (not saved).

What does this mean? Will I need to backup my codes? Thanks

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en1 Английский CSGO_is_life 2016-09-01 11:12:08 320 Initial revision (published)