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Differential vs incremental?

By macx
Sep 1, 2016
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  1. I've read numerous explanations of those terms and still am not clear.

    Is there one of those that, during backup, only changes to the parts of the files are made or is the full file replaced with the latest version? Is there any major advantage to one or the other? Not looking for anything
    complicated, just want to update the backup for any file I've changed and add any new ones.

    Thanks
     
  2. jobeard

    jobeard TS Ambassador Posts: 9,317   +618

    Both require a baseline FULL BACKUP and that will have a timestamp, like all files.
    • Incremental: creates backup files of changes since the last one was taken
    • differential: creates a file of changes since the FULL backup
    The difference is easily seen when attempting a restore:
    • the incremental requires, in the correct sequence, the FULL, plus each and every incremental
    • the differential requires ONLY the FULL plus the last differential.
     
  3. macx

    macx TS Evangelist Topic Starter Posts: 712

    To narrow that down a bit, does differential create NEW files of changes, and if so does it replace the older update, or does it update the changes WITHIN those backed up files

    Sounds like differential would be the easiest to use if a full restoration would be necessary?

    If WD can't get their WD Backup software to work (and which is it, differential or incremental?) what is a good alternative?
    Some time ago I tried Cobian backup, but only used it one time. I see now there are numerous backup apps available. Free is of course preferred, and something that's setup so it's easy to use.

    Thanks!
     
  4. jobeard

    jobeard TS Ambassador Posts: 9,317   +618

    There's no updating of the backup files . . . that would severely impact the restore choices. Sometimes we need a backup to a specific date, even though there may be several other and newer ones available. Regardless of which type of backup you elect to create, each backup taken will have its own file with a unique timestamp.
    certainly
    Don't have that software, but many such systems allow the user to CHOOSE the type of backup.
     

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