احفظ النسخة الاحتياطية في ملف على الكمبيوتر.

It is fully understandable in Egypt, but it sounds closer to Modern Standard Arabic (MSA) than everyday casual Egyptian speech.

Why:

• النسخة الاحتياطية is a formal way to say backup copy
• The overall wording is neat and instructional, like something you might see in software or a manual

In everyday Egyptian, people might also say things like:

• احفظ الباك أب في ملف على الكمبيوتر
• احفظ نسخة احتياطية في ملف على الكمبيوتر
• احفظ الباكاب عالكمبيوتر

So the given sentence is natural in a formal or semi-formal context, especially in written instructions.

احفظ means save or keep/save here.

It is the imperative form, used to give a command:

• احفظ = save!

This form is addressed to one male in both MSA and Egyptian-style usage.

Related forms:

• to one female: احفظي
• to more than one person: احفظوا

The base verb is:

• حفظ / يحفظ = to preserve, save, memorize, keep

In computer language, احفظ commonly means save.

النسخة الاحتياطية means the backup copy or the backup.

Both words have الـ because احتياطية is an adjective describing نسخة, and in Arabic, adjectives usually match the noun in:

• definiteness
• gender
• number

So:

• نسخة احتياطية = a backup copy
• النسخة الاحتياطية = the backup copy

Here:

• نسخة is feminine singular
• احتياطية is also feminine singular
• both are definite because of الـ

Because it describes نسخة, and نسخة is a feminine noun.

Arabic adjectives must agree with the noun they describe, so:

• نسخة = feminine
• therefore احتياطية must also be feminine

That is why you get:

• نسخة احتياطية
• النسخة الاحتياطية

If the noun were masculine, the adjective would usually be masculine too.

في ملف literally means in a file.

In computer-related Arabic, في is often used where English might say:

• in a file
• into a file
• sometimes even to a file, depending on context

So in this sentence, في ملف means the backup should be saved in/into a file.

Word by word:

• في = in
• ملف = file

This is very normal Arabic phrasing.

Because Arabic often uses على in places where English uses on.

So:

• على الكمبيوتر = on the computer

This is the normal expression for devices and surfaces:

• على الهاتف = on the phone
• على الشاشة = on the screen
• على الكمبيوتر = on the computer

If you said في الكمبيوتر, it would sound more like inside the computer, focusing on the interior rather than the device as a platform.

Yes, the ل is pronounced here.

That is because ح is a moon letter, not a sun letter.

So:

• الاحتياطية is pronounced roughly al-iḥtiyāṭiyya

The ل stays audible:

• al-...

Compare that with a sun-letter word, where the ل would assimilate.

A rough pronunciation of the full phrase:

• iḥfaẓ en-noskha l-eḥteyāṭeyya fī malaf ʿala l-kombyūtar

In Egyptian-style pronunciation, learners may hear slight reductions or connected speech, but the ل of الـ before ح is still not assimilated.

This is a very normal Arabic structure:

• احفظ = verb
• النسخة الاحتياطية = object
• في ملف = prepositional phrase
• على الكمبيوتر = another prepositional phrase

So the sentence is basically:

• Save
  • the backup copy
    • in a file
      • on the computer

Arabic often starts commands with the verb, so this order is very natural.

You change the imperative ending.

To one man:

• احفظ النسخة الاحتياطية في ملف على الكمبيوتر

To one woman:

• احفظي النسخة الاحتياطية في ملف على الكمبيوتر

To a group:

• احفظوا النسخة الاحتياطية في ملف على الكمبيوتر

This is a very useful pattern to learn with commands.

Yes. ملف is the standard Arabic word for file, including a computer file.

It can also mean a file in the general sense, like:

• a dossier
• a folder
• a case file

In computer contexts, ملف is extremely common and natural.

In everyday Egyptian speech, some people may also use English-based words in tech contexts, but ملف is standard and widely understood.

Yes, very often.

In everyday Egyptian tech speech, many people use:

• باك أب
• باكاب

So instead of النسخة الاحتياطية, you may hear:

• الباك أب
• نسخة باك أب

That said, النسخة الاحتياطية is still correct and clear, especially in formal writing, menus, instructions, or translations of software text.