휴대폰 보안·저장공간 진단: 화면별 정리 가이드

[Diagnostic Area: Storage Space]

1. Current Status Check

Google Photos automatic backup settings, storage capacity management, and photo classification strategy are necessary in this situation. Setting clear criteria before the business trip will help reduce mistakes.

2. Execution Guide (Step-by-step)

A. Google Photos Automatic Backup Setup (Time required: 5 minutes)

1. Open the Google Photos app or install it from the Play Store.
2. Go to profile icon in the top right > Photo Settings.
3. Find the "Backup and Sync" item and switch it ON.
4. On the backup quality selection screen:
   • "High Quality" (recommended): Compress and save within free storage capacity. No storage limit.
   • "Original": Save in original resolution. May require Google One subscription for additional storage.
5. Start backup while connected to Wi-Fi.

How to check backup status:

• Google Photos app > Library at bottom > Check backup status
• Wait until all photos are uploaded to the cloud (may take several hours).

B. Understanding Google Photos Free Storage and Strategy

Free storage provided:
Google Photos' free storage policy varies depending on when you start using the service, so be sure to check the current exact amount directly in the app settings.

General guidelines (for reference, check latest information):

• When selecting High Quality: Often unlimited or very generous storage capacity
• When selecting Original: Share Google account's free storage space (usually 15GB) with Google Drive and Gmail

How to actually check:

1. Google Photos app > Profile icon > Storage usage status
2. If set to "High Quality," you can back up most photos for free
3. If current free storage is insufficient, follow the app's guidance to consider upgrading to paid Google One plan or organizing lower resolution photos.

Tip for quick progress before business trip:

• Set to "High Quality" and wait with sufficient time on Wi-Fi for backup to complete.
• Wait for backup to complete before deleting from phone—this is safest.

C. Distinguishing Between Sync and Backup (Important)

An important concept clarification is needed here:

Google Photos "Backup":

• Copies photos from your phone to the cloud.
• Even if deleted from the phone, photos remain in the cloud.
• Can be re-downloaded later if needed.

If it were a "Sync" service (caution needed):

• Phone and cloud always stay in the same state.
• If deleted from phone, automatically deleted from cloud.

Google Photos uses the backup method, so even if deleted from the phone, it remains in the cloud. However, never delete immediately if unsure—wait until cloud backup is 100% complete, then wait 3 more days before deleting.

D. Photo Classification Tips (Effective Judgment Criteria)

Classify photos using step-by-step questions (30-second judgment technique):

Question 1: "If I saw this photo for the first time now, would I want to save it?"

• No → Candidate for deletion
• Yes → Move to next question

Question 2: "Is there a possibility I'll look at this photo again in a year?"

• Almost none (30% or less) → Candidate for deletion
• Yes (30% or more) → Keep

This warning requires immediate action. Let me go through this step by step.

① Emergency Response: Check Google Account Security (Right Now)

1. Go to Settings > Account > Google (or Gmail app > Menu > Manage your account).
2. Tap the 'Security' tab.
3. Check the 'My devices' or 'Signed-in devices' section.
4. Look for any unfamiliar devices or sign-ins from unknown locations.
5. If you find any, sign out that device.

② Change Your Password (Required)

1. In the same Security tab, tap 'Password'.
2. Enter your current password and change to a new password.
3. New Password Tip: Rather than something short and complex like P@ss1!, a sentence-form password made of 4 words strung together is safer.
   • Example: purple-umbrella-coffee-tuesday (enter this as your password)
   • This type is easy to remember and much stronger.

③ Set Up Two-Factor Authentication (Important)

1. Find 'Two-Factor Authentication' in the same Security tab.
2. Press 'Start'.
3. Choose Authentication Method:
   • Select 'Authentication App' (safer than text codes)
   • You'll need an app like Google Authenticator or Naver Authenticator
4. Scan the QR code that appears on screen with your authentication app.
5. Enter the 6-digit number generated in the authentication app.
6. Get backup codes ← Very important!
   • This is your key to recovering your account if you lose your phone.
   • Write these codes on paper and keep them in a safe place at home.

④ Quick Phone Safety Check

Without making it complicated, just check 3 things:

Check 1: Are there any unfamiliar apps installed?

• Settings > Apps > Sort by Installation Date
• In the past month's installed apps, delete anything where you think "Did I really install this?"

Check 2: Are all passwords for important accounts different?

• Bank, email, payment → These 3 must have different passwords
• If you're currently using the same password, change each one now

Check 3: Is two-factor authentication turned on?

• Bank app, email app > Security > Check two-factor authentication
• If not set up yet, configure it now

Just doing these 3 things will secure over 80% of your basic security.

⑤ What to Do Now (Priority Order)

1. Right now: Change Google account password + sign out unfamiliar devices
2. Next 10 minutes: Set up two-factor authentication on your Google account + store backup codes
3. By tomorrow: Change passwords on bank and email accounts too + set up two-factor authentication

Once your Google account security is organized, proceed with the same method for your bank and email accounts.

Start with the Google account part now, and if you get stuck or confused anywhere, just let me know. I'll explain each step in more detail.

Checking the background execution status of apps can have an important impact on your smartphone's performance and battery life. However, which apps are safe to close depends on each app's function. Generally, the following apps are safe to close:

1. Social media apps (for example: Facebook, Instagram): You can receive notifications again, so it is fine to close them.
2. News apps: You can check the latest news again, so there is no problem closing them.
3. Game apps: You can restart the game, so it is safe to close them.
4. Some utility apps (for example: calculator, notepad): If you are not using them, you can close them.

On the other hand, it is better not to close the following apps:

1. Messaging apps (for example: KakaoTalk, WhatsApp): They must continue running for real-time notifications.
2. Map apps: If current location tracking is needed, closing them can be inconvenient.
3. Music streaming apps: If music is playing, closing them will stop playback.

It is good to decide whether to close each app by judging its importance. If necessary, you can also adjust the background execution permissions in the app's settings. If you have any additional questions, please let me know!