yes! A single portable hard drive can be used to back up more than one computer. but don't forget that which backup file is of which computer
Portable hard drives are worth it if you need to take a lot of your data with you away from your computer. Some people use them as a safe back up for their computer system. If you have information that you want to be sure is backed up, then a portable hard drive may be worth it for you.
Back up hard drive
the best way is with an external hard drive
"Many companies have started storing all of their record by computer. While this is very convenient, a computer virus may crash your computer and wipe out your hard drive taking all your files with it. To be on the safe side back up all of your office records on a portable thumb drive, portable hard drive, an/or have a physical copy in a filing cabinet."
All you have to do is go to the folder with the name of your computer (ie. John Smith) and copy the Favorites file to a flash drive or portable hard drive. This will back your favorites up.
Sorry there is no possible way to view deleted history. But if you made a back up copy on a portable hard drive and deleted it only on the computer you can copy the files from the portable hard drive back onto the computer so will see them back. Hope that help :)
The main difference is size and speed, and do not forget prize. In addition, the fact that external disks are connected to the computer at all time may cause the disk to be infected. Therefore, I would recommend you to use a portable disk, and do a backup once a week or month.
"A back up drive is very useful to have. If your computer crashes, a back up drive can hold all of your important information that you saved on your computer. Back up drives can store important files such as pictures and other documents."
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The small, rectangular USB ports located either on the front or the back of the computer if it is a tower; laptops have them on the sides. A single port is approximately 1.4cm in width.
Look at the computer manual or read the back of the battery or hard drive.
Portable Planes can be everything from simple rubber powered ones to the sort that you attach to the back of a car so the car can fly. Because of the range of sizes of 'portable planes' it is difficult to give one single answer.