Long trem backup

[Nowinbob]

OS agnostic topic:I am using a 2 TB external HDD,Ext4,to back up data.Is there a utility that will check the integrity of the backup files,especially the ones that have never been accessed?I can use my peppermint laptop to do this,but my Mint tower would be a lot faster.I have over a TB of backup files.

[Pepper9]

Perhaps this (or something similar) is what you are looking for when it comes to file integrity check? 

AIDE (Advanced Intrusion Detection Enviornment) is a tool to check the file integrity. It is an opensource substitute for TRIPWIRE. It allows to take snapshots of all the major configuration files, binaries as well as libraries stats. And helps to find which binaries have been changed in case of compromisation of the system. This can be downloaded from http://sourceforge.net.

https://www.howtoforge.com/linux-security-notes-aide-file-integrity