kazoku no syasin ha betuno foruda ni hozonsite imasu.

Here, の links two nouns.

• 家族 = family
• 写真 = photo(s)

So 家族の写真 means family photos or photos of the family.

In general, A の B can mean things like:

• B of A
• B belonging to A
• B related to A

So this phrase could mean either:

• photos showing the family
• the family’s photos

Usually the intended meaning is clear from context.

は marks the topic of the sentence.

So in:

家族の写真は別のフォルダに保存しています。

the speaker is talking about family photos as the topic:
As for the family photos, ...

This does not necessarily mean 写真 is the grammatical subject in the same way as English. It just tells you what the sentence is about.

A natural way to feel it is:

• 家族の写真は = as for the family photos
• 別のフォルダに保存しています = I store them in a different folder

Good question. With 保存する, you might expect:

• 家族の写真を保存しています

because を often marks the direct object.

But in this sentence, 家族の写真 has been made the topic with は, so を is not used there.

Compare:

• 家族の写真を別のフォルダに保存しています。
  = I am saving/store family photos in a different folder.

• 家族の写真は別のフォルダに保存しています。
  = As for family photos, I save/store them in a different folder.

The second one has a topic nuance, and can also imply contrast, such as “family photos, at least, are stored in a different folder.”

別の means another or different.

• 別 by itself means separate or different
• 別の + noun = a different/another noun

So:

• 別のフォルダ = a different folder / another folder

The の is needed here because 別の acts like a modifier before a noun.

Examples:

• 別の人 = another person
• 別の方法 = a different method
• 別のフォルダ = another folder

に marks the location/destination where something is placed, stored, or directed.

So:

• フォルダに保存する = to save/store in a folder

Here, に shows where the photos are being stored.

Compare:

• 箱に入れる = put into a box
• ファイルに書く = write into a file
• フォルダに保存する = save into a folder

〜ています can be tricky because it does not always match English -ing exactly.

With 保存する, 保存しています often means one of these depending on context:

• I am saving it
• I save/store it
• It is kept/stored

In a sentence like this, it often sounds like a habitual action or current arrangement:

• I store family photos in a different folder
• Family photos are kept in a different folder

So even though 〜ています looks like a progressive form, it can also describe an ongoing state or routine.

Both are possible, but the nuance is a little different.

• 保存します can sound more like a simple statement, policy, or future action.
• 保存しています often sounds more like a current habit, ongoing practice, or existing state.

So:

• 家族の写真は別のフォルダに保存します。
  = I will save / I save family photos in a different folder.

• 家族の写真は別のフォルダに保存しています。
  = I keep/store family photos in a different folder.

In everyday situations, 〜ています often feels natural when talking about how things are normally organized.

Yes, 保存する is very common, especially for computers, files, photos, and data.

It often means:

• to save
• to store
• to preserve

With digital things, it is a very natural choice:

• 写真を保存する = save a photo
• ファイルを保存する = save a file

It can sound slightly more formal or technical than some everyday verbs, but in a sentence about folders, it is completely natural.

It can mean either, because の is broad.

Possible meanings:

• photos that show the family
• photos belonging to the family

In many real situations, 家族の写真 is understood as photos of one’s family.

If you wanted to be more explicit, you could say:

• 家族が写っている写真 = photos in which the family appears

But the original phrasing is very normal and natural.

Japanese normally puts the verb at the end of the sentence.

So the structure is roughly:

• 家族の写真は = family photos, as for them
• 別のフォルダに = in a different folder
• 保存しています = store/am storing

This is a very standard Japanese pattern:

[topic] + [place/location] + [verb]

English and Japanese organize information differently, so it is best not to translate word-for-word.

Yes. フォルダ is a katakana loanword from English folder.

It is commonly used for digital folders on a computer or phone.

Pronunciation is adapted to Japanese sound patterns, so it sounds more like:

• fo-ru-da

Katakana words often work this way in Japanese.

Often yes.

• 別のフォルダ = a different folder / another folder
• 他のフォルダ = another folder / some other folder

They overlap a lot, but there can be a slight nuance difference:

• 別の emphasizes different/separate
• 他の emphasizes other/another

In this sentence, both would usually sound fine.

No, normal Japanese writing usually does not use spaces between words.

It would normally be written as:

家族の写真は別のフォルダに保存しています。

Spaces are sometimes added in learning materials to make the sentence easier to read for beginners.