You can use something like a dedicated server or high priced cloud storage blocks for backup, but I would recommend something designed for the purpose, especially for server backup. You end up with a better better system at a lower cost by using the right tool for the job.
For example, Clonebox takes care of rotating your backups with an innovative algorithm so you always have a copy from this morning, from yesterday, from last week, and from last month. With block level deduplication provided by the system, you don't pay extra for the four increments. Sometimes you want to know what has changed since the backup to see what went wrong on the main system. Clonebox does that comparison for you. In many such ways it's better for backup because that's what it's made for. If you got a backup server, you'd be paying for CPU, RAM, and rack space you're not using. You can boot a Clonebox clone of your server, without paying for those CPUs to sit idle every month. It's the right tool for the job.
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