Mais tarde, a editora sugeriu por e-mail outra receita e recomendou fazer uma cópia de segurança do ficheiro.

Mais tarde means later or later on.

It is placed at the beginning to set the time frame for the whole sentence, just like English Later, .... Portuguese often puts time expressions first for clarity or emphasis.

So:

• Mais tarde, ... = Later, ...

You could move it, but sentence-initial position is very natural.

Editora can mean different things depending on context:

• female editor
• publishing house / publisher

In this sentence, the exact meaning depends on the translation/context you were given. Grammatically, a shows that the noun is feminine.

Related forms:

• o editor = male editor
• a editora = female editor
• a editora can also mean the publishing company

So this is one of those words where context matters a lot.

They are in the pretérito perfeito simples (the simple past / preterite).

• sugeriu = suggested
• recomendou = recommended

This tense is used for completed actions in the past.

Infinitives:

• sugerir → sugeriu
• recomendar → recomendou

Por e-mail means by email or via email.

Portuguese commonly uses por to express the means or channel through which something happens:

• por telefone = by phone
• por escrito = in writing
• por e-mail = by email

Pelo e-mail usually sounds more like through the email or through the email account/message, and is not the normal choice here.

So:

• sugeriu por e-mail = suggested by email

Portuguese does not always use an indefinite article where English might use a/an.

Here, outra receita simply means another recipe. That is already indefinite by nature, so uma is not necessary.

Compare:

• sugeriu outra receita = suggested another recipe
• sugeriu uma receita = suggested a recipe

Both are possible, but they mean slightly different things:

• uma receita = a recipe
• outra receita = another recipe

After recomendar, Portuguese often uses an infinitive to express the action being recommended.

So:

• recomendou fazer uma cópia de segurança = recommended making a backup

This structure is very common:

• recomendar + infinitive

Examples:

• recomendou esperar = recommended waiting
• recomendou verificar o ficheiro = recommended checking the file

Portuguese could also use other structures in some contexts, but recomendou fazer is very natural and standard.

Yes, that is possible, but the structure changes.

• recomendou fazer uma cópia de segurança = recommended making a backup
• recomendou que fizesse uma cópia de segurança = recommended that someone make a backup

The version with que + subjunctive is more explicit about there being a separate subject. The infinitive version is more compact and very common.

In this sentence, recomendou fazer is natural because the focus is on the recommended action itself.

It means a backup copy or simply a backup.

Literally, it is something like a safety copy:

• cópia = copy
• de segurança = for safety / as protection

In European Portuguese, this is a standard way to say backup.

You may also hear:

• backup in informal or technical contexts

But cópia de segurança is the more standard Portuguese expression.

Do is the contraction of:

• de + o = do

So:

• do ficheiro = of the file / the file’s

Examples:

• a capa do livro = the cover of the book
• o nome do autor = the name of the author

Here:

• uma cópia de segurança do ficheiro = a backup copy of the file

Yes. Ficheiro is the usual European Portuguese word for file in the computer sense.

In Brazilian Portuguese, arquivo is more common for a computer file.

So:

• European Portuguese: ficheiro
• Brazilian Portuguese: arquivo

A learner of Portuguese from Portugal should definitely know ficheiro, because it is the normal word in Portugal.

In the most natural reading, por e-mail goes mainly with sugeriu:

• a editora sugeriu por e-mail outra receita
• e recomendou fazer uma cópia de segurança do ficheiro

So the structure is:

1. she suggested another recipe by email
2. and she recommended making a backup of the file

A listener may understand that both recommendations were made in the email, but grammatically por e-mail is attached most directly to sugeriu.

Because Portuguese often omits repeated subjects when they are clear from context.

Here, the subject of both verbs is the same:

• a editora sugeriu ...
• (a editora) recomendou ...

Repeating a editora would be possible, but unnecessary and less natural.

This is very common in Portuguese:

• Ela entrou, sentou-se e começou a trabalhar.
• She came in, sat down, and started working.

Yes, it is fully natural.

The structure is:

• Mais tarde = time expression
• a editora = subject
• sugeriu = verb
• por e-mail = means/channel
• outra receita = object
• e recomendou = second verb
• fazer uma cópia de segurança do ficheiro = infinitive clause/object

Portuguese word order is often flexible, but this sentence is straightforward and idiomatic in European Portuguese.