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Accra Backup Client can backup opened and locked files. This feature only applies when running on Microsoft Windows platform.    

 

Volume Shadow Copy (Volume Snapshot Service or Volume Shadow Copy Service or VSS),

 

Many applications running on Microsoft Windows OS can choose to lock their data files ( databases, Outlook PST file, etc...). This often create problems when other applications, such as the Accra Backup client, want to read these files during backup. Volume Shadow Copy or VSS, is a technology included in Microsoft Windows that allow taking manual or automatic backup copies or snapshots of data, even if it has a lock, on a specific volume at a specific point in time over regular intervals.

 

Disadvantage of using VSS

 

The time to backup increases significantly when you use VSS. This speed difference is more prominent if you have large files. The Accra Backup client needs to calculate the MD5 signature of every file during backup. To speed up the matching process, these signatures are cached for files larger than 10 MB. This cache is not used when using VSS, which can significantly slow down the matching process.

 

Therefore, we recommend you use this feature only if you are sure you have open and locked files. Moreover, consider separating profiles for files that are locked and the ones that may be opened but not locked.