Altaro VM Backup Support Centre

What type of Compression does Altaro VM Backup Use?

Last Updated: Jan 17, 2017 12:11PM CET
We use the QuickLZ compression library.  We compress the data on a block level and not on a whole file so the compressed Altaro backups can only be decompressed using Altaro VM Backup itself.
As for the compression rate, it depends on the data contained inside the Virtual Disks.  If it’s a static Virtual Disk with most of it being empty than the compression rate is huge.  Unfortunately we cannot give accurate compression rates as it all depends on what type of data is being compressed in the backup.
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