Yes, this is my OS drive. So I have OS in C: partition & data in various other partitions. So that data should be safe even if my OS gets infected right ?
No, *all* data on any drives connected to the PC is at risk if you get infected. The only time having different drives/partitions helps is if the virus tries to wipe the system partition. But viruses can easily destroy or damage *any* data on drives connected to the system, including files that are accessible on a server over the network, regardless of how many separate drives or partitions you have.
One of my stock market application stores the price data in its own folder. So application & data both are in the same folder & that application is installed in C: Partition. Now I have collected that data painstakingly spending one hour a day for last 5 years. ( 32 GB total ) So that data is at risk if I get infected right ? If so what is the solution ? ( I do back up that entire folder once a week on another HDD.
The solution is to keep backups (which you are doing). However, if you can't afford to lose even a week of data, then the backups need to be more frequent (daily).
Some other things to consider:
- If you connect the backup drive while the system is infected, you could lose the primary copy *and* the backup at the same time.
- If you are backing up the entire drive every week (instead of just backing up new files), and using the same external drive every time, then you are extremely vulnerable to corruption of existing files on the PC (due to flaky hardware or virus). The corrupted copies will over-write the good ones the next time you do a backup, and you will have no good copies left!
If this data is very valuable to you, you should also be periodically archiving everything to another drive (in addition to the existing backup drive), and that drive should get put somewhere safe.