There could be any number of reasons.
If th computer to be backed up is off, sleeping, hibernating then your backup application needs to be able to deal with that.
If you are doing it over a lan you should check that WOL is enabled (Wake On Lan)
If its a laptop then these have TWO sets of power settings on is for battery use and may well shut down, put to sleep, or hibernate your computer. Backing up on battery power is never recommended.
Even if its a laptop and on a power outlet then the power setting for the computer may still be set to do the things mentioned.
And even if it is a regular desktop type computer these too have setting for power and may even have a setting to shut down the hard drive if it has been idle too long..
To check these features go to Control panel, then select Power Options.
You will see any boxes that need to be changed if you read the function.
Also some hardware has power saving features all of their own and these can be found by going to the control panel, system, hardware, device manager, and then going through the individual properties for each piece of hardware.
In your case and esp if your back is to lan or a usb drive then check those hardware items first for any energy saving features that need to be turned off.
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