hikae ga nai to ato de komaru kamo sirenai node, syasin mo totte okimasita.

Here, 控え means something like a copy, a record, or a backup.

Depending on context, it could refer to:

• a copy of a document
• a written note of some information
• a receipt stub or record
• some kind of backup reference

So 控えがない means there is no copy/record.

Because ない here is describing existence, not taking a direct object.

• 控えがない = there is no copy
• が marks the thing that does not exist

This is similar to:

• お金がない = I have no money
• 時間がない = I have no time

Using をない would be ungrammatical here.

ないと means if there isn’t... or if you don’t have...

In this sentence:

• 控えがないと = if there’s no copy / if I don’t have a record

This is a casual way of expressing a condition. It is related to forms like:

• なければ
• なかったら

So 控えがないと困る means it would be a problem if there were no copy.

Yes. In many cases, learners can think of ないと as a conversational conditional meaning if not...

For example:

• 早く行かないと。 = I have to go soon / If I don’t go soon, it’ll be bad.
• 勉強しないと。 = I have to study.

In your sentence, it literally connects to the following idea:

• 控えがないと、あとで困る = If there’s no copy, I’ll be in trouble later

So it often carries a natural otherwise something bad may happen feeling.

あとで means later.

So:

• あとで困る = be in trouble later
• later on, it might cause problems

It shows that the problem would not happen immediately, but at some later time.

困る means to be troubled, to have a problem, or to be inconvenienced.

It is often used when something causes difficulty:

• お金がなくて困る。 = I’m in trouble because I have no money.
• 道がわからなくて困った。 = I had trouble because I didn’t know the way.

In this sentence:

• あとで困るかもしれない = I might have trouble later

It does not necessarily mean a huge disaster; it can also mean it would be inconvenient.

The expression is normally written as かもしれない, but for learners it is often spaced out to show the parts.

As a grammar point, かもしれない means:

• might
• may
• perhaps

So:

• 困るかもしれない = might be a problem / might cause trouble

Even though it contains parts like かも and しれない, you should usually learn it as one fixed expression: かもしれない.

It applies to the idea right before it:

• あとで困るかもしれない = might be in trouble later

So the uncertain part is being in trouble later, not the reason clause as a whole.

The speaker is saying:

• Because I might run into trouble later if I don’t have a copy, I took a photo too.

Both ので and から can mean because, but they feel a little different.

• ので sounds a bit softer, more explanatory, and often more polite
• から can sound more direct or more assertive

Here:

• 困るかもしれないので = because it might be a problem later

Using ので fits well because the speaker is calmly explaining their reason.

も means also or too.

So 写真も撮っておきました suggests that taking photos was done in addition to something else.

Possible implied meanings:

• I wrote it down, and also took photos
• I kept some other kind of record, and also took pictures

Even if the other action is not stated, も gives that feeling of as an extra measure.

撮っておきました comes from 撮っておく, which means:

• to do something in advance
• to do something beforehand
• to do something and leave it that way for future use

So:

• 写真を撮りました = I took a photo
• 写真を撮っておきました = I took a photo in advance / just in case / for later

That nuance is very important here. The speaker is not just saying they took a photo; they are saying they did it as preparation because it might be needed later.

〜ておく is a very common pattern. It often means one of these:

1. Do something in preparation

   • 予約しておく = make a reservation in advance
   • メモしておく = make a note for later

2. Do something and leave it as is

   • ドアを開けておく = leave the door open

In your sentence, it is the first meaning:

• 写真も撮っておきました = I took photos too, for future use / just in case

Because the speaker is reporting an action they already completed.

• 撮っておきます = I’ll take a photo in advance
• 撮っておきました = I took a photo in advance

So the whole sentence is explaining a completed precaution:

• Since it might be a problem later if there’s no copy, I took photos too.

Japanese often leaves out the subject when it is understood from context.

So あとで困るかもしれない could mean:

• I might be in trouble later
• we might be in trouble later
• you might be in trouble later

In many everyday situations, the most natural reading is:

• I might have trouble later or
• it might cause problems later

The exact subject is often omitted because Japanese relies heavily on context.

It is polite overall because it ends with 〜ました:

• 撮っておきました

Also, ので sounds relatively soft and polite.

At the same time, parts like ないと are conversational and natural. So the sentence feels like everyday polite Japanese:

• not extremely formal
• not rough or casual
• very natural in speech and writing

Yes, exactly. That is a very natural interpretation.

The sentence suggests:

• a copy/record might be necessary later
• so the speaker made sure to keep one
• and as an extra precaution, they also took photos

This is why 写真も and 撮っておきました fit so well: they show a backup action taken in preparation for possible future trouble.