123 Synonyms & Antonyms of BACK (UP) - Merriam-Webster
https://www.merriam-webster.com/thesaurus/back (up)Synonyms & Near Synonyms for back (up) avouch, testify (to), vouch (for), witness argue, attest, authenticate, bear out, certify, confirm, corroborate, substantiate, support, validate, verify, …
Synonyms of backed up | Infoplease
https://www.infoplease.com › back...Verb · 1. support, back up · 2. back up, back off, back down, withdraw, retreat, pull away, draw back, recede, pull back, retire, move back · 3. back, back up, ...
Best 43 synonyms for backup - Thesaurus
https://thesaurus.yourdictionary.com › ...The best 43 synonyms for backup, including: spare, substitute, emergency, supplementary, championship, computer backup, standby, understudy, supplemental, ...