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When a long backup will soon occur or is running, will it go on and end even if the enter-sleep-mode settings is foreseen earlier?

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Most Macs made since 2011 feature "Power Nap" mode, which will allow Time Machine to run while the machine is sleeping. On machines made prior to 2011 I am unsure. –  bispymusic May 21 '13 at 16:52
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There is a sleep assertion for Time Machine. So while doing a backup your mac won't enter sleep mode. If you are not sure, while a backup is in progress, check with this command: pmset -g assertions. In the processes that prevent sleep mode you will found: BackgroundTask named: "Time Machine backup"

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