Window 7 Download
Differential backup for Windows/Linux
There are a lot of ways of doing differential backups, tons of software, freeware of shareware. I want to share one I didn’t know about which I liked very much. It is unfair so little information can be found the Net about 7-zip archival tool, which can handle differential backups with ease. Article is for CLI geeks, who understands where to push these commands )
First, some According to wiki:
An incremental backup is a backup method in which multiple backups are kept (not just the last one). These backups will be incremental if each original piece of backed up information is stored only once, and then successive backups contain only the information that changed since a previous backup.
A Differential backup is a cumulative backup of all changes made since the last full or normal backup, i.e., the differences since the last full backup
I am talking about Differential backup, which contains one FULL archive and several DIFFERENTIAL archives on different date each.
7zip
Is really great tool for archiving files. Linux and win32 platform support, crossplaform archiving, multi threading support. Install 7zip:
- Windows, download
- Ubuntu: aptitude install p7zip
Magic
First stage is to create full backup which is fairly easy:
7za a c:archive.7z c:folder_to_archive
Create differential archive with name diff1.7z
7za u c:archive.7z c:folder_to_archive -ms=off -mx=9 -t7z -u- -up0q3r2x2y2z0w2!c:diff1.7z
-mx=9 – best compression
-t7z – 7z archive type
I suggest to use date in diff archive name.
Wtf “-up0q3r2x2y2z0w2!c:diff1.7z” is ?
Actions mask to determinite 7z behavior
p – File exists in archive, but is not matched with wildcard. q – File exists in archive, but doesn’t exist on disk. r – File doesn’t exist in archive, but exists on disk. x – File in archive is newer than the file on disk. y – File in archive is older than the file on disk. z – File in archive is same as the file on disk w – Can not be detected what file is newer (times are the same, sizes are different)
Number means action:
0 Ignore file (don’t create item in new archive for this file) 1 Copy file (copy from old archive to new) 2 Compress (compress file from disk to new archive) 3 Create Anti-item (item that will delete file or directory during extracting). This feature is supported only in 7z format
More detailes on this switch here:
http://www.bugaco.com/7zip/MANUAL/switches/update.htm
Extracting
Extracting master archive:
7za.exe x c:archive.7z -oc:recovery_path
Extracting differential archive on top to the same folder
7za.exe x c:archive.7z -aoa -y -oc:recovery_path
-aoa Overwrite All existing files without prompt.
-y (assume Yes on all queries) switch
7zip Anti-item
When creating differential archive 7zip matches files that have been deleted and creates anti-file entry which tells 7zipextractor actually do delete file when overriding master archive. Thats why resulting recovery folder will look the same as on archiving stage.
About the Author
windows 7 download, CD boot setup and installation
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