Die Sicherungskopie verhindert Datenverlust.

Because Sicherungskopie is a feminine noun in German, so its nominative singular article is die.

In this sentence, die Sicherungskopie is the subject, so German uses the nominative form:

• die Sicherungskopie = the backup copy

A learner often has to memorize the noun together with its gender:

• die Sicherungskopie
• plural: die Sicherungskopien

Because the verb has to agree with the subject.

The subject is die Sicherungskopie, which is third person singular. So the verb verhindern changes to:

• ich verhindere
• du verhinderst
• er/sie/es verhindert
• wir verhindern
• ihr verhindert
• sie/Sie verhindern

So:

• Die Sicherungskopie verhindert Datenverlust.

This is the same idea as English the backup copy prevent vs the backup copy prevents. German also marks that -t ending.

German often leaves out the article when speaking generally about something, especially with abstract or uncountable ideas.

Here, Datenverlust means data loss in a general sense, not a specific instance of data loss. So:

• Die Sicherungskopie verhindert Datenverlust. = A backup copy prevents data loss / The backup copy prevents data loss.

You could add an article in some contexts, but it would change the nuance:

• den Datenverlust would usually sound like a specific, known data loss
• no article sounds more general and natural here

Yes. Sicherungskopie is a compound noun, which is very common in German.

It is made from:

• Sicherung = securing, backup, protection
• Kopie = copy

Together:

• Sicherungskopie = backup copy

In German, the last part of a compound usually determines the grammatical gender. Since die Kopie is feminine, die Sicherungskopie is also feminine.

Verhindern means to prevent, to stop something from happening, or to avert.

In this sentence:

• Die Sicherungskopie verhindert Datenverlust.
• A backup copy prevents data loss.

It is a very common verb used with nouns that describe negative events:

• einen Unfall verhindern = to prevent an accident
• Fehler verhindern = to prevent errors
• Datenverlust verhindern = to prevent data loss

Because German very often combines related nouns into a single compound noun.

Here:

• Daten = data
• Verlust = loss

So:

• Datenverlust = data loss

This is completely normal in German. English often uses separate words where German prefers one compound word.

More examples:

• Datensicherung = data backup
• Computerprogramm = computer program
• Benutzername = username

Because the compound literally means loss of data.

• Daten = data
• Verlust = loss

So Datenverlust is built from the idea data loss, not loss of one datum.

This is very natural in German compounds: the first part often stays in a form that reflects the normal meaning, even though the whole thing becomes a single noun.

It is in the accusative case, because it is the direct object of the verb verhindert.

You can ask:

• What does the backup copy prevent?
• Datenverlust

So:

• Die Sicherungskopie = subject, nominative
• verhindert = verb
• Datenverlust = direct object, accusative

In this specific sentence, you do not see a visible case ending on Datenverlust, because there is no article and the noun itself does not change form here.

No, this is the normal German main-clause word order:

• Die Sicherungskopie = subject
• verhindert = finite verb
• Datenverlust = object

So the pattern is:

• Subject + Verb + Object

German main clauses usually put the finite verb in second position, and that is exactly what happens here.

Yes, absolutely. In everyday German, especially in tech contexts, das Backup is very common.

So both are possible:

• Die Sicherungskopie verhindert Datenverlust.
• Das Backup verhindert Datenverlust.

The difference is mainly style:

• Sicherungskopie sounds more fully German and a bit more formal or technical
• Backup is common in modern everyday and IT German

Also note the gender difference:

• die Sicherungskopie
• das Backup

A helpful rough guide for an English speaker is:

• ZI-khe-rungs-ko-PEE

A few details:

• Sicherung starts with a z sound like ts
• ch in Sicherung is the softer German sound, not like English ch in chair
• Kopie is pronounced roughly ko-PEE
• the stress is mainly on -pie in Kopie

And verhindert Datenverlust is roughly:

• fer-HIN-dert DAH-ten-fer-LOOST

These are only approximations, but they can help you get started.

Because in German, all nouns are capitalized, not just proper names.

So in this sentence:

• Sicherungskopie is a noun
• Datenverlust is a noun

That is why they begin with capital letters:

• Die Sicherungskopie verhindert Datenverlust.

This is one of the most noticeable spelling differences between English and German.