pull/10/head
Dennis Schwerdel 2017-06-19 23:22:33 +02:00
parent 2fe62cbe27
commit 012e009bc4
3 changed files with 143 additions and 129 deletions

166
Cargo.lock generated
View File

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@ -19,8 +19,8 @@ clap = "2.23"
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sodiumoxide = "0.0.14"
libsodium-sys = "0.0.14"
sodiumoxide = "0.0.15"
libsodium-sys = "0.0.15"
filetime = "0.1"
regex = "0.2"
fuse = "0.3"

102
README.md
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@ -84,60 +84,80 @@ their contents. Once mounted, graphical programs like file managers can be used
to work on the backup data and find the needed files.
## Example usage
## Example scenario
As an example, I am going to backup my projects folder. To do that, I am
initializing an encrypted zVault repository, storing the data on a remote
filesystem which has been mounted on `/mnt/backup`.
#$> zvault init :: --encrypt --remote /mnt/backup
public: 2bea1d15...
secret: 3698a88c...
I am using zVault on several of my computers. Here are some numbers from my
desktop PC. On this computer I am running daily backups of both the system `/`
(exclusing some folder like `/home`) with 12.9 GiB and the home folder `/home`
with 53.6 GiB.
$> zvault config ::
Bundle size: 25.0 MiB
Chunker: fastcdc/16
Compression: brotli/3
Encryption: 2bea1d15...
Encryption: 8678d...
Hash method: blake2
The repository has been created and zVault has generated as new key pair for me.
I should now store this key pair in a safe location before I continue.
The backup repository uses the default configuration with encryption enabled.
The repository currently contains 12 backup versions of each folder. Both
folders combined currently contain over 66.5 GiB not counting changed between
the different versions.
Now I can backup my home directory to the repository.
$> zvault info ::
Bundles: 1675
Total size: 37.9 GiB
Uncompressed size: 58.1 GiB
Compression ratio: 65.3%
Chunk count: 5580237
Average chunk size: 10.9 KiB
Index: 192.0 MiB, 67% full
#$> zvault backup /home/dswd/projects ::projects1
info: No reference backup found, doing a full scan instead
Date: Thu, 6 Apr 2017 20:33:20 +0200
Source: dswd-desktop:/home/dswd/projects
Duration: 0:00:26.2
Entries: 14618 files, 6044 dirs
Total backup size: 1.4 GiB
Modified data size: 1.4 GiB
Deduplicated size: 1.2 GiB, 14.9% saved
Compressed size: 0.5 GiB in 23 bundles, 54.7% saved
Chunk count: 95151, avg size: 12.8 KiB
The repository info reveals that the data stored in the repository is only
58.1 GiB, so 8.4 GiB / 12.5% has been saved by deduplication. Another 20.2 GiB /
34.7% have been saved by compression. In total, 28.6 out of 66.5 GiB / 43% have
been saved in total.
The backup run took about 26 seconds and by looking at the data, I see that
deduplication saved about 15% and compression again saved over 50% so that in
the end my backup only uses 0.5 GiB out of 1.4 GiB.
The data is stored in over 5 million chunks of an average size of 10.9 KiB. The
average chunk is smaller than configured because of files smaller than the chunk
size. The chunks are stored in an index file which takes up 192 MiB on disk and
in memory during backup runs. Additionally, 337 MiB of bundle data is stored
locally to allow fast access to metadata. In total that is less than 1% of the
original data.
After some work, I create another backup.
$> zvault info ::home/2017-06-19
Date: Mon, 19 Jun 2017 00:00:48 +0200
Source: desktop:/home
Duration: 0:01:57.2
Entries: 193624 files, 40651 dirs
Total backup size: 53.6 GiB
Modified data size: 2.4 GiB
Deduplicated size: 50.8 MiB, 97.9% saved
Compressed size: 8.9 MiB in 2 bundles, 82.4% saved
Chunk count: 2443, avg size: 21.3 KiB
#$> zvault backup /home/dswd/projects ::projects2
info: Using backup projects1 as reference
Date: Thu, 6 Apr 2017 20:46:19 +0200
Source: dswd-desktop:/home/dswd/projects
Duration: 0:00:00.7
Entries: 14626 files, 6046 dirs
Total backup size: 1.4 GiB
Modified data size: 27.2 MiB
Deduplicated size: 17.2 MiB, 36.9% saved
Compressed size: 6.1 MiB in 2 bundles, 64.4% saved
Chunk count: 995, avg size: 17.7 KiB
This is the information on the last backup run for `/home`. The total data in
that backup is 53.6 GiB of which 2.4 GiB have been detected to have changed by
comparing file dates to the last backup. Of those changed files, deduplication
reduced the data to 50.8 MiB and compression reduced this to 8.9 MiB. The whole
backup run took less than 2 minutes.
This time, the backup run took less than a second as zVault skipped most of
the folder because it was unchanged. The backup only stored 6.1 MiB of data.
This shows the true potential of deduplication.
$> zvault info ::system/2017-06-19
Date: Mon, 19 Jun 2017 00:00:01 +0200
Source: desktop:/
Duration: 0:00:46.5
Entries: 435905 files, 56257 dirs
Total backup size: 12.9 GiB
Modified data size: 43.1 MiB
Deduplicated size: 6.8 MiB, 84.2% saved
Compressed size: 1.9 MiB in 2 bundles, 72.3% saved
Chunk count: 497, avg size: 14.0 KiB
The information of the last backup run for `/` looks similar. Out of 12.9 GiB,
deduplication and compression reduced the new data to 1.9 MiB and the backup
took less than one minute.
This data seems representative as other backup runs and other systems yield
similar results.
### Semantic Versioning