I suggest keeping system images of a clean setup on an external drive that is kept unplugged from the system. Easy and fast restore.
+1
Any security strategy should include a backup plan.
Backing up data and disk imaging (redundancy) are among the most important prevention tasks users should perform on a regular basis to protect themselves from malware infection, yet it's still one of the most neglected areas.
A backup strategy is not only effective against ransomware and other harmful malware but also helps with catastrophic scenarios like hard disk failure, power failure and power surges which can damage internal hardware components. In some cases, the system can be rendered unbootable and you may not have access to the computer to back up any data. A computer's hard drive will not last forever and at some point its going to fail and eventually need replacing. Hard disk failure can occur suddenly without warning or it could occur gradually due to failing areas of the disc requiring repeated read attempts before successful access or as a result of bad clusters accumulating over time to the point the drive becomes unusable. Finally, there is always the possibility of system wide issues after applying Microsoft patches and even data loss due to buggy Windows updates.
IMPORTANT!!! When implementing a backup strategy include testing to ensure it works before an emergency arises; routinely check to verify backups are being made and stored properly; and isolate all backups (offline) to a device that is not always connected to the network or home computer so they are unreachable. If not, you risk not only malware infection but ransomware encrypting your backups and any backups of the backups when it strikes.
Many home users just buy an external hard drive, copy their critical data to it, disconnect the device and store it in a safe/secure location rather than try to monitor and maintain a complex backup system. Program like
SoftByte Labs Comparator make doing these types of backups quick and easy for the average user or in between creating system images.