Data compression takes place directly on the device with the client application installed, which is responsible for backing up data. Xopero uses two algorithms for compression - for files/folders it is the Deflate64 algorithm, for HDD image copies the LZ4 algorithm.
Compression ratio:
| Algorithm | Compression ratio | Comments |
| Deflate64 | 40-60% | Not all file types can be compressed with equal performance - for example, text files usually compress well, achieving a high compression ratio, while other formats, such as multimedia files, do not compress properly and achieve very low compression rates, no matter how strong (and slow) compression is used. |
| LZ4 | 60% | The stream compression provided by LZ4 allows you to maintain a stable compression ratoi - 60% of disk usage (empty blocks are skipped in the backup process) |
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