Backup:-

Data is the most important aspect of your computer. An operating system can be reinstalled and so can applications, but it may be difficult or impossible to recreate your original data. It is essential that you always back up your important information and have a plan for recovering from a system failure

different security concerns for back up to be lost or stolen so we should the things to secured as follows

Ensure your security policies include backup-related systems within their scope. Practically every type of security policy -- from access controls to physical security to system monitoring -- applies directly to data backups.
Include your data backup systems in your disaster recovery and incident response plans. Data backups can be breached, compromised or destroyed. Be it a malware outbreak, employee break-in or hurricane -- otherwise good backups can be adversely affected and you need to have a plan outlining what you're going to do if that time comes. …show more content…
Be sure not to overlook any Web-based interfaces that provide backup access and keep your original backup software media secured as well.
Store your backups offsite or at least in another building. I know this sounds pretty basic, but I still see it a lot. A fire or other incident could be all that's needed to take out your data center and your backups in one fell swoop.
However you choose to store your backups -- be it on tape, network-attached storage (NAS), or external drives -- be sure to control access to the room/car/house in which the backups stored. Handle your backup media as you would any other critical