Safeguard

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late Middle English (denoting protection or safe conduct): from Old French sauve garde, from sauve ‘safe’ + garde ‘guard’. Compare with saggar.

wiktionary

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From Middle English savegard, from Middle French sauvegarde, from Old French salve garde, sauve garde, reconstructed as safe +‎ guard.

etymonline

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safeguard (n.)

late 14c., "protection, safety," from Old French sauve garde "safekeeping, safeguard" (13c.), from salve, sauve (fem. of sauf; see safe (adj.)) + garde "a keeping" (see guard (n.)). Meaning "something that offers security from danger" is recorded from late 15c.

safeguard (v.)

mid-15c., from safeguard (n.). Related: Safeguarded; safeguarding.