Data Back up process in Official server

It is generally observed that Laptop or Desktop provided by Employer , has Data back up process in regular interval.

Most Laptop users are keeping their personal data ( Bank details , Loan details , CV etc) stored in the same Laptop as provided by employer. Hence during back up process , those personal data is also being stored in Official server. Under this situation it is advisable to save personal data in a drive / sub-drive/ partition which is being skipped during regular data back up.