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Interval in which the database is checked for image files located on writeable file systems of the configured #FileSystemGroupID to compress.
Format: interval[!from-to] or NEVER
interval = poll interval in minutes (##m) or hours (##h).
from = start hour (0-23) when no compression should be performed
to = end hour (0-23) when no compression should be performed
NEVER = disable automatic compression
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