Vembu license Sync

Hi I am new to Vembu.. As a test I configured Vemdu BDR (Free Version) for my Vsphere ESXi and seems working fine.. As noticed the default config is every 24 hrs will check the license synchronization.. Is the sync is compulsory?.. Or what if the server not connected to internet ?..If the server is not connected to internet will affect the backup/restore tasks?...awaiting your valuable info.. thanks in advnace

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