אני רוצה גיבוי לפני שאני מוחקת את הקובץ.

Because the clause after לפני ש־ is a full clause: שאני מוחקת את הקובץ = that I am deleting the file / that I delete the file.

Hebrew often repeats the subject in this kind of structure, so:

• אני רוצה גיבוי = I want a backup
• לפני שאני מוחקת את הקובץ = before I delete the file

In English, we also keep the subject: before I delete the file, not just before delete the file.

Hebrew can sometimes phrase this differently, but with לפני שאני..., the repeated אני is completely normal.

מוחקת is the feminine singular present-tense form of the verb למחוק (to delete / erase).

So this sentence is being said by a female speaker.

Compare:

• אני מוחקת = I delete / I’m deleting (female speaker)
• אני מוחק = I delete / I’m deleting (male speaker)

The earlier word רוצה is written the same way for both masculine and feminine in normal spelling, but מוחקת makes the speaker’s gender clear here.

In writing without vowel marks, yes: רוצה is written the same for both.

But the pronunciation is different:

• male: רוצה = rotze
• female: רוצה = rotza

So in this sentence:

• אני רוצה could be said by either a man or a woman if you only look at spelling
• מוחקת shows that the speaker is female, so here רוצה would be pronounced rotza

This is very common in Hebrew. The present tense can express an action that is about to happen, is planned, or is understood from context.

So לפני שאני מוחקת את הקובץ literally looks like before I am deleting the file, but naturally it means:

• before I delete the file
• before deleting the file

Hebrew often uses present tense where English prefers a simple present with future meaning.

A more formal or more explicitly future version could be:

• לפני שאמחק את הקובץ = before I delete the file

Both are understandable, but לפני שאני מוחקת... sounds very natural in everyday speech.

לפני means before.
When it is followed by a whole clause, Hebrew usually adds ש־.

So:

• לפני המחיקה = before the deletion
• לפני שאני מוחקת את הקובץ = before I delete the file

You can think of ש־ here as introducing the clause, something like that / when / as depending on context, though in English we usually do not translate it directly.

את marks a definite direct object.

Here, הקובץ means the file, which is definite because of ה־ (the). So Hebrew uses את before it:

• מוחקת את הקובץ = deleting the file

But with an indefinite object, you would usually not use את:

• מוחקת קובץ = deleting a file

So:

• את does not mean with here
• it is a grammar marker used before a definite direct object

הקובץ means the file, while קובץ means a file or just file.

Since the sentence refers to a specific file, Hebrew uses the definite article ה־:

• קובץ = a file
• הקובץ = the file

Because it is definite, it also takes את:

• מוחקת קובץ = deleting a file
• מוחקת את הקובץ = deleting the file

גיבוי means backup.

In computer context, it usually means a saved copy of data in case something goes wrong. So in this sentence, אני רוצה גיבוי means:

• I want a backup
• I want to make sure there is a backup copy

It is a noun, not a verb here.

Related expressions:

• לעשות גיבוי = to make a backup
• קובץ גיבוי = backup file

Not exactly from the Hebrew as written.

The actual Hebrew says:

• אני רוצה גיבוי = I want a backup

That focuses on having a backup, not specifically on the action to back up.

If you wanted to say I want to back it up before I delete the file, Hebrew would more likely use a verb phrase such as:

• אני רוצה לגבות את הקובץ לפני שאני מוחקת אותו

That means I want to back up the file before I delete it.

So גיבוי is the thing wanted, not the action itself.

Yes. למחוק can mean:

• to erase
• to delete
• sometimes more generally to wipe out / remove

In computer contexts, למחוק קובץ very naturally means to delete a file.

So מוחקת את הקובץ here is best understood as deleting the file, even though the same verb can also be used in non-digital contexts like erasing writing.

Yes. A common shorter version would be:

• אני רוצה גיבוי לפני מחיקת הקובץ

Literally: I want a backup before the deletion of the file.

This version is a bit more compact and slightly more formal or written in style.
The original:

• אני רוצה גיבוי לפני שאני מוחקת את הקובץ

sounds very natural and conversational.

So both are good, but the original is especially useful for learners because its structure is very transparent.