You can very easily keep OpenDocument (LibreOffice, OpenOffice and, at a push Microsoft Office) documents under version control in a Git repository.
You need the odt2txt (Archlinux package) whichis a simple converter from OpenDocument Text to plain text.
With that installed, configure Git to use it as a diff engine:
Firstly, configure git to use
odt2txt by adding to
[diff "odf"] textconv=odt2txt
Secondly, in the repository, create or add to
*.ods diff=odf *.odt diff=odf *.odp diff=odf
And that's it. My initial observations are that this works but
git diff doesn't show non-text differences (such as modifying a chart colour). The fact the file is changed is recognised however.
Also, a stand-alone command-line utility oodiff allows command-line diff activities:
$ ./oodiff foo.ods bar.ods