Incremental backup programs


  1. Posts : 75
    windows 10
       #1

    Incremental backup programs


    Windows 10 does not do incremental backups but I want to know about them.I have a program that runs files from a folder and I keep adding files to the folder it runs from. Some of the files I add have the same file name but have changed slightly. When I do an incremental backup what exactly would a backup program look for (file name, size, date modified etc...)?
      My Computer


  2. Posts : 303
    Windows 10 (2), Win 8.1 (1), Win 7 (1)
       #2

    Look at Macrium Reflect. You would need the paid version to get the incremental option.

    JohnD
      My Computer


  3. Posts : 13,565
    Windows10
       #3

    johnpd said:
    Look at Macrium Reflect. You would need the paid version to get the incremental option.

    JohnD
    The Free version does differential backups which is quite adequate for small differences.

    A diff backup contains all the changes since last full backup.

    So if Full had File A version 1 and diff had File A version 2, then if you restore Full backup, you get File A version 1. If you select the Diff (+full) backup, you get File A version 2.
      My Computer


  4. Posts : 75
    windows 10
    Thread Starter
       #4

    Supposed they are both named file a but are different sizes or date modified. Someone just updated file a but did not change the name.
      My Computer


  5. Posts : 34,907
    Win 10 Pro (1903) (2nd PC is 21H2)
       #5

    Hi, the detailed rules used by a given backup program (there are many) can be particular to that program.

    If you take Macrium Reflect (File and Folder Backup - licensed version) as an example, (rather than disk imaging which may have been mentioned above, being more familiar), you could put a question to Macrium themselves. It may be hard to discover such information from published documentation.

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  6. Posts : 24,562
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #6

    bha19 said:
    Supposed they are both named file a but are different sizes or date modified. Someone just updated file a but did not change the name.
    I use Macrium images to back up the entire system, but separately I have written a batch command file to copy my user files to an external drive. Originally it used the XCOPY command but now uses the more powerful RoboCopy command. Both commands have /S and /M options that works the same way...

    /S :: copy Subdirectories, but not empty ones.
    ...
    /M :: copy only files with the Archive attribute and reset it.
    ...so to do a full backup of all files I first use the command ATTRIB *.* +A /S to set the archive attribute for all files. Xcopy/Robocopy with their /S /M options will copy all files and clear the archive attribute. Any modification of a file will set the Archive attribute, it will also be set for any new files. So the next run of Xcopy/RoboCopy /S /M will only copy the new or modified files since the last full backup.
      My Computers


  7. Posts : 13,565
    Windows10
       #7

    bha19 said:
    Supposed they are both named file a but are different sizes or date modified. Someone just updated file a but did not change the name.
    Exactly as I said. It purely depends on which backup you restore. If you restore the inc/diff backup any new file there superseded older version.
      My Computer


 

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