Thanks for the report, and sorry about the trouble. I’ve fixed this in the next release. The behaviour appears to have been inherited from the original Updraft plugin and never changed since then – https://plugins.svn.wordpress.org/updraft/tags/0.6.1/updraft.php (the ‘retain_range’ function) – if a number outside of the range (1, 3650) was entered, then it got set to 1. Now changed so that if a number greater than 9999 is entered, then the setting is set to 9999, which is obviously much closer to the user’s intention.