Compression error: ... an error prevented a file from being processed. (527)


This error is given when a file cannot be copied because it is being used by another program. SyncBackLite/SE/Pro can copy open/locked files, but only if certain requirements are met:

https://help.2brightsparks.com/support/solutions/articles/43000335703


If you do not meet those requirements then you must close the program that has the file open. The following article contains details on discovering which program is using the file:

https://help.2brightsparks.com/support/solutions/articles/43000335786


You may be able to avoid this error: modify your profile, go to the Compression tab, and tick the option Try and compress files that are being used.