How to backup the computer if contains virus?

[miwa5]

May I know how to I backup the files if virus inside the PC? Can u show me step-by-step how to backup? Thanks.

 

[RolandJS]

There is no step-by-step guide at this point. We need a lot more details than what has been provided so far. What usb or dvd boots do you have? What external media do you have?

 

[Alejandro85]

The most important thing to remember is that once a computer is infected, it can never be safely booted into again. Every data left on the drive not on a proper backup must be accessed by using another, known-clean OS.

The easiest way to to use a portable OS (like a Linux-based one "live CD") or the Windows installer disk to copy all the data to an external media. Another option is to pull the HD and put it as secondary drive in another system, then copy files there.
Just remember to copy the data files only and don't attempt to run any software still on the infected disk. As for the software itself, redownload it all from its official website (or use a known-clean backup), even for the OS. When you're done, reformat the infected machine and reinstall everything from scratch. Backed up data can then be safely restored there.
As an extra precaution, scanning the data files with an antivirus could be useful too. Delete anything that shows infected.

For the newly reinstalled system, remember to setup automated backups so that any future incident is easy to recover from. Backup both your data and installers of every software you use.

 

[Lady Fitzgerald]

Actually, once a computer has become infected, it is too late to make a safe backup since backups should be made only from uninfected computers (such as after running antivirus and other antimalware scans). Backups taken from an infected computer will probably also be infected and can also infect another computer.

The only safe thing to do at this point is to try to clean out the infection by using a good antivirus program and various other antimalware programs, such as MBAM (sadly, I can't recommend the latest version of MBAM right now), and pray you do not lose any data in the process. If your data is critical, it would be best to turn it over to a paid data recovery professional to hopefully clean it with minimal data loss; however, that will be expensive. In fact, I strongly recommend seeking out a professional data recovery specialist. Data recovery techniques will vary with equipment and the nature of the problem so any attempt to fix it yourself will likely result in disaster since there is no way for any of us to diagnose the exact nature of your problem remotely (although there will be many people attempting to advise you on how to fix it yourself).

In the future, you need to frequently backup your computer and keep several versions of the backups so, should your latest backup(s) turn out to also be infected, you can revert to a still earlier version that was made before the computer became infected. Also, automated backups are an extremely bad idea because they would require a backup drive to be permanently connected to the computer, exposing the backup drive to the very same infection you are trying to avoid. The only way to have reasonably safe backups is to connect the backup to the computer only while updating the backup and to not update backups until you have run thorough scans with an antivirus program and with other antimalware programs.

 

[samuria]

We need to know how do you know you have a virus and what type is it as it may not be a virus but a pup