incremental backup software for Windows

Incremental Backup, what it is and how to setup

There are two Types of Incremental Backups

Differential Incremental Backup
archives all files changed (or created) since the last incremental or complete backup.
Cumulative Incremental Backup
archives all files changed (or created) since the last complete (or full) backup.

The diffence is in the number of backup media to restore if you want to recover a previous state:

Using differential incremental backup you have to restore at first the last complete backup, and then every incremental backup.

Using cumulative incremental backup you restore only the last complete backup and the only incremental backup.

An Example

You put all work in a folder like "my documents", and you start with a complete backup of all files in there; on every day of the week you edit a file "<day>.doc"; so:

  • on monday you edit monday.doc
  • on tuesday you edit tuesday.doc
  • etc....

Your backup scheme is to perform a daily incremental backup and a weekly complete backup. What is the difference between differential and cumulative incremental backup?

Using differential incremental backup a single backup contains the file just created, using cumulative incremental backup the last incremental backup is same as a complete backup.

Daily Backup uses differential incremental backups, but speeds up the restoration by reverse retrieval:

It restores at first the most recent incremental backup, and continues till the last complete backup. It stores the retrieved files in a list, and does not retrieve them again. This trick speeds up the restoration.

Daily Backup costs $19.95 US
Platforms
Windows®
95/98/Me
NT 4.0/2000/XP

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How it Works

The way it works

You specify the directories Daily Backup should backup into zip archives. You can set filters to handle only certain file types, or to confine the backup to certain filetypes only. Then it watches the operating system, and marks a directory as "ready for backup" on each file creation or modification.

You specify when to start an incremental backup on a marked directory:

  • as soon as a change occurs
  • when the screensaver is running (not available on win95 or winNT)
  • every timespan
  • on shutdown
  • at a fixed time

You schedule a complete backup when:

  • daily
  • weekly
  • monthly

You can also start a complete backup manually.

Daily Backup creates the zip archives in archive directories. You can setup as many archive directories as you need.

These archive directories should reside on a 2nd hard drive, on a network drive, or a USB micro hard drive.

You can use it as a date based version system

With time you get dated versions of your important files. In case you need to step back in time you can do so:

The restore dialog shows you all the saved files in a single table, and you can restore:

  • all directories with just a click.
  • the version of a single directory up to a single day only.
  • a single version of single file only.

Of course it asks your permission to overwrite any file before restoring, and you can select a different directory to store the retrieved file(s).

In case of a disaster, when you only have the archive directories, you can restore the files with any Daily Backup installation. Just select the archive directory in the restoration dialog.