Final answer:
After backing up data on a removable hard disk, it's best to store the backup in a fireproof safe or transfer it to an offsite location for maximum protection against physical and environmental damage.
Step-by-step explanation:
Data backup is the practice of copying data from a primary to a secondary location, to protect it in case of a disaster, accident or malicious action. Data is the lifeblood of modern organizations, and losing data can cause massive damage and disrupt business operations. After making a backup of system data using a removable hard disk, the safest and most professional option would be to store the backup in a fireproof safe.
This practice helps in protecting the data from physical damage due to fires or other disasters. Alternatively, depending on the level of safety and redundancy you want to achieve, you might also consider transferring the backup to an offsite location. This offsite storage further protects against data loss from events that may affect the primary location such as natural disasters.
It is not advisable to leave the backup connected to the computer, as it could be subject to the same online threats as the computer itself. Similarly, keeping the backup in the same room as the computer does not guard against situations where the entire room's contents might be compromised.