Maximum PC has an interesting article listing the uses we can give our PC while you sleep. The best solution, of course, is turned off if not used, but if you have a PC dedicated to web downloads / system security with Vitamin D , surely we can optimize these hours, doing well, some of these proposed tasks:

Running security software - Why not take advantage of these hours of leisure (for PC), to schedule our antivirus ? In Microsoft Security Essentials is as easy as going to Settings / Scheduled Scan, and daily schedule to a time when we are not in the PC

Perform Backups – Another good job for our tireless PC. At night, we can program our computer to do backups. We saw several tools for this, as EASEUS All Backup , or my favorite, SyncBack , which automates everything.

Running a distributed computing serviico - It’s a kind of screensaver that downloads pieces of data, and begin to analyze it on multiple PCs The best known are SETI @ Home and Folding @ Home

Download file - The most common task for PCs night: downloaded files. At night, when not using the PC, we can spend all the bandwidth to uTorrent , JDownloader, Steam, or whatever you want to download. The Bonus? The next morning, when they awake, they will have a big smile on his face to see how many new files .