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CalahanReed's avatar
CalahanReed
Iron Contributor
Jan 14, 2026

Backup larger than copy on Windows computer?

weird thing, I made a backup with macrium 8, the saved part is C: on Disk F:
I am surprised that there is a huge difference between the saved image and the result image on F:
I know there's compression, but that's huge, isn't it ?
your opinion ? thanks

1 Reply

  • Rendiyu's avatar
    Rendiyu
    Iron Contributor

    Macrium Reflect uses advanced compression algorithms (like LZ4, ZSTD, or others), which can drastically reduce the size of the backup if the data contains many repetitive or compressible files.

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