[pwg]

> One thing which concerns me is the integrity of my files. It's no good backing them up if they become corrupt without me knowing. Most of my files like photos, old emails, etc will never change and I want to keep it that way.

Look into par2 files (https://github.com/Parchive/par2cmdline).

Arrange your 'backup data' in some logical way, then generate par2 files for logical "groups" (i.e, per directory containing a set of files, etc.) with an amount of 'redundancy' you feel comfortable with.

You can then periodically run par2 scans of the static backups to both detect changes, and to repair the changes (provided the changes are not larger than the amount of redundancy you originally requested).