new posts

content/tech/HowTo_backup.md

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++++
+title = 'HowTo backup'
+date = 2024-08-10
+hidden = true
++++
+
+In short: 3-2-1 backup strategy.<!--more-->
+
+
+
+## Backup strategy
+
+You should have:
+ - 3 copies of data
+ - on 2 different types of storages
+ - including 1 off-site copy
+
+### Why so many copies?
+
+What if your main drive with data will die? That's the reason to have backup nearby.
+
+What if your main storage Server will die with all drives in it due to power spike (flood,etc...)? That's the reason to have off-site backup.
+
+![](https://imgs.xkcd.com/comics/backup_batteries.png)
+
+### 3 copies of data
+
+You should have:
+ - Original data
+ - 1 backup at place (another drive)
+ - 1 backup in another place (encrypted in cloud, HDD stored in another remote location (friend's house))
+
+Backups which should be made regularly (daily or more frequently for critical data, +depends how "hot" data (how fast it changes))
+
+### 2 types of storages
+
+You need to have different 2 types of storage to metigate if some error may affect all devices of 1 type. 
+
+Storage types examples:
+ - Internal HDD/SSD (we will focus on them)
+ - External HDD (them)
+ - USB drive/SSD
+ - Tape library
+ - Cloud storage (and them)
+
+### 1 off-site copy
+
+It's pretty simple:
+ - encrypted cloud backup
+ - encrypted HDD with backup in another town in friend's house (secured by bubble wrap)
+ - or at least encrypted HDD in another house (also secured by bubble wrap)
+
+The more distant this off-site backup the better.
+
+{{< spoiler Examples >}}
+
+ &nbsp;
+
+## Examples
+
+
+
+### Enterprise-ish (Expensive at start, hard setup, easy to maintain)
+
+Ceph cluster:
+ - requires 3 servers (at least) (OS - Proxmox)   
+ Ideally server motherboard, ECC RAM, Intel Xeon E5 v4 CPU Family or better / AMD Epyc analog
+ - any number of drives (but at least 3 drives)
+ Ideally enterpise-class (or with "RAID support"). The more IOPS - the better
+ - [automatic snapshots](https://github.com/draga79/cephfs-snp)
+ - 10Gb network (if you expect total 9-ish (or more) HDD drives or some SSDs)
+ - and ideally SSD cache (at least 2 SSDs with PLP) (1tb each more than enough for 10TB of raw storage) 
+ 
+Off-site backup:
+
+Cloud storage + [dublicati](https://github.com/duplicati/duplicati)  
+OR  
+Proxmoxx Backup Server at another city (e.g. at friend's house) with RAID1/5/6   
+ (thou you should set it up so if malware/hacker would get to root user it won't overwrite backups) 
+
+#### Pros
+ - Low chances of loosing data because you essentially have 3 copies (by default, 2 min) of  data + hourly/daily/weekly/montly snapshots  
+ So if you get 2 dead drives in a same time - you still won't loose your data  
+ Essentially it covers 2 copies of data 
+ - If drive fails - you simple take it out, put new drive in and say that you want add this drive to pool via WebGUI
+ - With SSD cache you can throw in any trashy HDD drives until they start to fail
+ - You can add any number of drives
+ - And if you need/want to be able to freely shutdown one of a servers and still be able to access data - you need to distribute drives so their raw storage would be even on each server.
+ Or just add in few more server and distribute drives between them so you would still be able to access this storage 
+ - If you get your house+servers destroed - you wouldn't loose your data  
+
+#### Cons
+ - Expect 30% usable space from raw storage (you can use Erasure Coding (RAID5 analog) but it will be slow as hell)
+ - Bad/Slow (in terms of IOPS and delay times) drives without PLP SSD cache can have amazingly bad total speed
+ - Power usage might be a burden if you don't have any 
+ - More performance comes with more drives because speed = available IOPS and avarage access time for 2-3 drives that have that data. So more drives, more IOPS we have (excluding SSD cache case)
+
+
+### Home-server (Medium setup, hard to maintain)
+
+#### Pros
+ - 
+ - 
+ - 
+
+#### Cons
+ - 
+ - 
+ - 
+### Home PC (Medium setup, hard to maintain)
+
+#### Pros
+ - 
+ - 
+ - 
+
+#### Cons
+ - 
+ - 
+ - 
+### Portable Laptop (easy setup, hard to maintain)
+
+#### Pros
+ - 
+ - 
+ - 
+
+#### Cons
+ - 
+ - 
+ - 
+{{< /spoiler >}}
+
+{{< source >}}
+https://www.techtarget.com/searchdatabackup/definition/3-2-1-Backup-Strategy
+{{< /source >}}
+

content/tech/HowTo_buy_drives.md

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+title = 'HowTo Buy HDD'
+date = 2024-08-17
+hidden = true
++++
+
+
+
+## 
+
+
+https://www.extremetech.com/computing/170748-how-long-do-hard-drives-actually-live-for
+Consumer HDD drive have following survival chances:
+ - 92% survival chance for 1.5y (due to manafacturing errors) (5.1% per year)
+ - 90% survival for 3 years (due to random failure) (1.41% per year)
+ - -12% every following year (due to wear-out)
+For Enterprise HDDs survival a bit higher
+
+https://www.reddit.com/r/DataHoarder/comments/k4rc7a/comment/gedlp75/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
+Seller can have 97% positive review while scamming every 30th customer
+
+
+4tb
+	Price - 4600-3100p (cost of new / lifetime (3 years) * runtime as % of lifetime) (/2, /3)
+	Run time - 13000-17000h (1.5-2 years)
+2tb
+	Price 3300-2200p
+	(01,C7, 07,) No CRC errors, read errors, reassigned sectors (?) 
+1tb
+	Price - 1000p
+
+
+
+{{< source >}}
+https://www.reddit.com/r/DataHoarder/comments/1eg0kpf/brand_preference/
+https://www.reddit.com/r/DataHoarder/comments/k4rc7a/comment/gedlp75/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
+https://www.extremetech.com/computing/170748-how-long-do-hard-drives-actually-live-for
+{{< /source >}}

content/tech/HowTo_data_hoard/index.md

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++++
+title = 'HowTo Data Hoard'
+date = 2024-08-31
+hidden = true
++++
+
+![](https://preview.redd.it/this-meme-speaks-to-me-v0-j9dc4klgmw0a1.png?width=640&crop=smart&auto=webp&s=91e23f46de5cbc09861302fcc5b4d00e8192c193)
+
+
+## Who is data hoarder?
+
+
+
+Data hoarder archive large amounts of digital data (terrabytes) that might otherwise be lost, such as old video games, videos and websites.<!--more-->
+
+### Why does they do it?
+
+{{< spoiler "Spoiler" >}}
+Usually you start becoming data hoarder when something that you expected to be online and what you can freely access (e.g. bought video games/series on PSStore/Netflix) becomes inaccessable due to various reasons:
+ - Owner deletes data -	outdated information, [personal choice](https://www.reddit.com/r/techsupport/comments/u8vyl3/google_wont_remove_outdated_content_from_its/), hosting platform policy change
+ - Platform policies - if content/account violates guidelines [it gets removed](https://www.reddit.com/r/OneFinanceBank/comments/1d8cixt/did_they_just_take_down_the_other_one_subreddit/) (e.g. for hate speech, misinformation, or copyright infringement...)
+ - Legal reason - content may be removed due to legal issues, such as [DMCA takedown](https://www.dmca.com/FAQ/What-is-a-DMCA-Takedown), [court orders](https://www.newsbytesapp.com/news/entertainment/bombay-high-court-protects-arijit-singhs-personality-rights/story), [political stuff](https://www.reuters.com/business/media-telecom/youtube-blocks-russian-state-funded-media-channels-globally-2022-03-11/)
+ - Technical issues - drive on server may die and sysadmin forgot to try make disaster recovery beforehand, [cloud sync errors](https://spanning.com/blog/4-real-life-examples-of-saas-data-loss/)
+ - Archiving - platform may decide that this content no longer relevant/needed - so they move it to more harder to access place 
+
+{{< /spoiler >}}
+
+## HowTo Data Hoard
+
+1. [Buy terrabytes of drives](/tech/HowTo_buy_hdd)
+2. Access terrabytes of data 
+	- put drives in your PC
+	- build/buy NAS
+3. Use [3-2-1 backup](/tech/HowTo_backup) strategy for important data
+4. Download everything that you've ever needed in life and never delete
+	- [HowTo download site?](/tech/howto_download_site)
+	- [HowTo download youtube videos?](/tech/howto_download_youtube_video)
+
+
+{{< spoiler Spoiler >}}
+I forgot to remove it from template
+{{< /spoiler >}}
+
+
+{{< source >}}
+Random YouTube videos
+My Experience
+{{< /source >}}
+https://en.wikipedia.org/wiki/Digital_hoarding
+https://www.pewresearch.org/data-labs/2024/05/17/when-online-content-disappears/
+https://www.reddit.com/r/DataHoarder/
+https://www.reddit.com/r/DataHoarder/comments/yzb5m0/this_meme_speaks_to_me/

content/tech/HowTo_download_site.md

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+title = 'HowTo Download a website'
+date = 2024-08-24
++++
+```
+wget \
+     --recursive \
+     --level=inf \
+     --no-clobber \
+     --page-requisites \
+     --adjust-extension \
+     --span-hosts \
+     --user-agent=Mozilla \
+     --convert-links \
+     --no-parent \
+     -e robots=off \
+     --domains blog.ca.sual.in \
+       https://blog.ca.sual.in/
+```
+
+It will download my site. You can download specific subdirectory.
+
+You may want to decrease `--level` - its' depth for subdirectories download.  
+`--domains` - limits to specific domain.
+
+
+  <!-- "© Casual, 2024" TODO - this thing have last link from source -->
+
+{{< source >}}
+https://superuser.com/questions/1415717/how-to-download-an-entire-site-with-wget-including-its-images#1415765
+https://simpleit.rocks/linux/how-to-download-a-website-with-wget-the-right-way/
+{{< /source >}}
+
+
+          
+        

content/tech/HowTo_download_youtube_video.md

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+title = 'HowTo Download Youtube video'
+date = 2024-08-03
++++
+
+1. [Install yt-dlp](https://github.com/yt-dlp/yt-dlp/wiki/Installation#using-the-release-binary)  
+```bash 
+curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o ~/.local/bin/yt-dlp; chmod a+rx ~/.local/bin/yt-dlp
+```
+<!-- TODO make scroll bar black -->
+2. Download a Video or Playlist  
+```bash 
+yt-dlp -f "best[height<=1080]+bestaudio" https://www.youtube.com/watch?v=kf5eUikyXYA
+```
+### Options cheatsheet
+
+ - Download video in best quality - `yt-dlp -f bestvideo+bestaudio <URL>`
+ - Download 1080p video - `yt-dlp -f "best[height<=1080]+bestaudio" <URL>`
+ - Download mp3 audio - `yt-dlp --extract-audio --audio-format mp3 --audio-quality 0 <URL>`
+ - Resume download - `yt-dlp -c <URL>`
+
+
+{{< source >}}
+https://github.com/yt-dlp/yt-dlp/
+https://ostechnix.com/yt-dlp-tutorial/
+random cheatsheet from navi TODO it's link, need to fix shortcode
+{{< /source >}}

hugo.yaml

@@ -115,6 +115,26 @@ params:
     #test rm me
 
 markup:
+  highlight:
+    # anchorLineNos: false
+    # codeFences: false
+    # guessSyntax: true
+    # hl_Lines: ""
+    # hl_inline: false
+    # lineAnchors: ""
+    # lineNoStart: 1
+    # lineNos: false
+    # lineNumbersInTable: true
+    # noClasses: true
+    # noHl: false
+    # style: github-dark
+    style: solarized-dark256
+    # style: xcode-dark
+    # style: xcode-dark
+    # style: tokyonight-storm
+    # style: nord
+    # style: modus-vivendi
+    # tabWidth: 4
   goldmark:
     renderer:
       unsafe: true # enable raw HTML in Markdown
@@ -126,3 +146,4 @@ markup:
 #     path: github.com/Junyi-99/hugo-theme-anubis2
 #   - path: anubis2
 # 
+

shell.nix

@@ -16,6 +16,6 @@
         xdg-open "https://blog.ca.sual.in/" &
         xdg-open "https://www.deepl.com/en/translator#ru/en-us/" &
         
-        hugo server
+        hugo server -DEF
       '';
 }

template.md

@@ -3,15 +3,20 @@ title = 'HowTo DO SOMETHING
 date = 2024-05-03
 +++
 
-<!-- &nbsp;  -->
-
 I forgot to write summary<!--more-->
 
+![](./img/10.png)
+
+
+{{< spoiler Examples >}}
+
+ &nbsp;
+
+## Examples
 
-{{< spoiler Spoiler >}}
 I forgot to remove it from template
-{{< /spoiler >}}
 
+{{< /spoiler >}}
 
 {{< source >}}
 Random YouTube videos

themes/anubis2/assets/css/dark.css

@@ -3,6 +3,9 @@
 /* --bg-color: #1d1e20; */
 --bg-color: #111111;
 
+/* white scroll fix */
+color-scheme: dark;
+
 
 /* --card-color: #2e2e33; */
 --card-color: #191919;
@@ -20,7 +23,7 @@
 --nav-link-color: #b6b6b6;
 
 --pre-color: #f8f8f2;
---pre-bg-color: rgba(175, 184, 193, 0.1);
+/* --pre-bg-color: rgba(175, 184, 193, 0.1); better look*/
 --pre-border-color: rgba(175, 184, 193, 0.3);
 
 --bq-color: #ccc;

themes/anubis2/assets/css/main.css

@@ -34,8 +34,13 @@
 :root {
     --card-border-radius: 0.5em;
     --card-margin: 1.5em;
+    /* --color-scheme: dark; */
 }
 
+/* pre { */
+/* 	color-scheme: dark; */
+/* } */
+
 html {
     font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
     /* 1 */
@@ -198,6 +203,7 @@ pre {
     overflow: auto;
     margin-top: 0;
     margin-bottom: 0;
+    overflow-x: auto;
 }
 
 code,
@@ -220,7 +226,7 @@ pre code, pre kbd {
 }
 
 /* Styles */
-
+/*  */
 blockquote {
     border-left: 2px solid var(--bq-color);
     padding: 0.1em 1em;