You can create a NetConfig job using LMS, which can do this for all LMS managed devices. You can simple select an Adhoc job and use command copy run start and schedule as per you requirement.
Check more details here on NetConfig.
Also, You can generate an Out-of-Sync report for the group of devices for which running configurations are not synchronized with the startup configuration from :
From here you can directly sync the devices which will do the same task of doing copy run start. Unfortunately, it cannot be scheduled and hence needs to be checked manually usually.
Check details on Out-of-Sync here.
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