Back up
Back up verb - Move backwards from a certain position.
Supplementary and back up are semantically related. In some cases you can use "Supplementary" instead an adjective "Back up".
Supplementary
Supplementary adjective - Available to supply something extra when needed.
Back up and supplementary are semantically related. Sometimes you can use "Back up" instead an adjective "Supplementary".
Mutual synonyms
Cite this Source
Supplementary and Back up. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/back_up/supplementary
Back up & Supplementary. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/back_up/supplementary>.
Supplementary or Back up. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/back_up/supplementary.
Google Ngram Viewer shows how "back up" and "supplementary" have occurred on timeline