How to verify backup integrity before restoration?

Creating a backup does not guarantee its operability, as files in the archive may turn out to be corrupted due to hardware failures or write errors. Integrity checking allows you to ensure that data is written correctly and that a working system can actually be restored from it. The simplest method involves comparing the checksums of the original data files and the resulting archive.

Most modern backup tools have built-in verification features that automatically test the archive immediately after its creation. However, complete confidence only comes after performing a trial restoration on an isolated test bench. Such verification helps identify hidden problems, such as missing dependencies, corrupted database indexes, or incorrectly copied configuration files.