It is far better to buy a tool that creates a compressed backup than a tool that compresses a standard SQL Server backup.
All the tools I know of that create a compressed backup run faster than the standard SQL backup. Also, you only need the disk space required for the finished backup.
If you get a file compress tool, this can only start work after the SQL backup has finished. You need enough disk space to hold the uncompressed backup plus the compressed version. Getting a script to reliably do the compress is harder than it apears.
Steve has given good advice - each backup product has its own strengths, you need to choose what fits your needs best.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 14 Mar 2017
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