It will depend upon how much data and programs you have on your system. A Windows 7 installation without any programs on it can be backed up in about 6 Gigabytes, so any modern external hard drive can do a 'system backup' of a modern operating system. It is the programs and documents that are on the system that take up the majority of space in an older computer.
Incremental
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There are several business in the Phoenix area that rent storage space. Storage space may be needed because a person is moving or possibly just because more space is needed. These storage areas provide a temporary home for whatever needs to be stored.
There is many online backup service providers in market such as Spider Oak, Zools, copy .they will provide the you online cloud storage space for store the data
You upload files to the storage space as a backup copy of content from your hard drive, as addition space to supplement your hard drive or you can make those files available online.
System backups are implemented using backup scheduling software and extra secondary storage space. The Windows OS features an inbuilt software program called Backup and Restore for this purpose.
A backup disc is usually not used for Windows itself or applications, but for personal data. Thus the amount of space needed depends entirely on how much space your files take up.
An operating system
Additional space is one of the main benefits of secondary storage. Reliability is another significant benefit as it keeps data safe.
1gb online storage
Some devices do not contain storage devices, or do not have enough storage space needed by a particular user. Extra storage devices such as an external hard drive can be utilized.
I use and recommend Handy Backup, it's easy and reliable backup software for home use.