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Kenneth Skovhede 8 years ago
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  1. 128
      _posts/articles/2016-10-14-Backup-Process.md

128
_posts/articles/2016-10-14-Backup-Process.md
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@ -74,8 +74,8 @@ When Duplicati recieves the first entry, `C:\data\`, it notices that the entry i
```json
[
{
"type": "folder",
"path": "C:\\data\\"
"type": "folder",
"path": "C:\\data\\"
}
]
```
@ -98,17 +98,17 @@ qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4= (4kb)
The file is then added to `filelist.json`, which now looks like this:
```
```json
[
{
"type": "Folder",
"path": "C:\\data\\"
"type": "Folder",
"path": "C:\\data\\"
},
{
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
}
]
```
@ -130,7 +130,7 @@ Additionally, a file hash is computed, but unlike a small file, the file hash is
We could choose to store these values directly in `filelist.json`, for example:
```
```json
{
"type": "File",
"path": "C:\\data\\myvideo.mp4",
@ -162,24 +162,24 @@ Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA= (96b)
The new file entry is then stored in filelist, which then looks like:
```
```json
[
{
"type": "Folder",
"path": "C:\\data\\"
"type": "Folder",
"path": "C:\\data\\"
},
{
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
},
{
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
}
]
```
@ -208,34 +208,34 @@ We chose to omit this part based on a number of observations:
This means that an additional entry for `C:\data\extra\olddoc.tx` will occur in `filelist.json`:
```
```json
[
{
"type": "Folder",
"path": "C:\\data\\"
"type": "Folder",
"path": "C:\\data\\"
},
{
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
},
{
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
},
{
"type": "Folder",
"path": "C:\\data\\extra"
"type": "Folder",
"path": "C:\\data\\extra"
},
{
"type": "File",
"path": "C:\\data\\extra\\olddoc.txt",
"size": 2048,
"hash": "R/XSNsb4ln/SkeJwFDd4Fv4OnW2QNIxMR4HItgg9qCE="
"type": "File",
"path": "C:\\data\\extra\\olddoc.txt",
"size": 2048,
"hash": "R/XSNsb4ln/SkeJwFDd4Fv4OnW2QNIxMR4HItgg9qCE="
}
]
```
@ -247,41 +247,41 @@ This approach is also known as [deduplication](https://en.wikipedia.org/wiki/Dat
The final contents of `filelist.json` is then:
```
```json
[
{
"type": "Folder",
"path": "C:\\data\\"
"type": "Folder",
"path": "C:\\data\\"
},
{
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
"type": "File",
"path": "C:\\data\\mydoc.txt",
"size": 4096,
"hash": "qaFXpxVTuYCuibb9P41VSeVn4pIaK8o3jUpJKqI4VF4="
},
{
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
"type": "File",
"path": "C:\\data\\myvideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
},
{
"type": "Folder",
"path": "C:\\data\\extra"
"type": "Folder",
"path": "C:\\data\\extra"
},
{
"type": "File",
"path": "C:\\data\\extra\\olddoc.txt",
"size": 2048,
"hash": "R/XSNsb4ln/SkeJwFDd4Fv4OnW2QNIxMR4HItgg9qCE="
"type": "File",
"path": "C:\\data\\extra\\olddoc.txt",
"size": 2048,
"hash": "R/XSNsb4ln/SkeJwFDd4Fv4OnW2QNIxMR4HItgg9qCE="
},
{
"type": "File",
"path": "C:\\data\\extra\\samevideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
"type": "File",
"path": "C:\\data\\extra\\samevideo.mp4",
"size": 215040,
"hash": "4sGwVN/QuWHD+yVI10qgYa4e2F5M4zXLKBQaf1rtTCs=",
"blocklists": [ "Uo1f4rVjNRX10HkxQxXauCrRv0wJOvStqt9gaUT0uPA=" ]
},
]
```
@ -306,4 +306,4 @@ Many details were omitted from the above example run, some of those details can
- A local database is used to keep track of hashes and files
- A `dindex` file is created to keep track of which `dblock` files have each hash
Some more details can be found in the whitepaper [A block-based storage model for remote online backups in a trust-no-one environment)](/assets/Block-basedstorageformat.pdf). Even more details in the [Duplicati source code](https://github.com/duplicati/duplicati).
Some more details can be found in the whitepaper [A block-based storage model for remote online backups in a trust-no-one environment)](/assets/Block-basedstorageformat.pdf). Even more details in the [Duplicati source code](https://github.com/duplicati/duplicati).
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