of [**up to date**]{} existing archives for precovery observations (preferably closer in time to discovery) could bring crucial information regarding the objects’ nature, orbital classification and virtual or imminent impacts.\
A [*web crawler*]{} (known also as a spider), is an Internet robot tool which systematically browses the World Wide Web with the aim to create entries to build or update a search engine index (e.g. [@Olston2010]). For automated update of the [*Mega-Archive*]{}, in 2014 we designed and implemented a crawler to check major archive collections on a daily basis. This PHP tool includes some scripts to query the ESO, CADC, SMOKA, ING and LCO collections, crawling the programmable interfaces published by each server (which very rarely need some minor changes of format). The only collection not able for automate crawling is the NVO archive, which we update manually on a yearly basis. The daily update tool starts to run automatically in cron every midnight and typically takes less than one hour to update all instrument archives in the [*Mega-Archive*]{}. Every SQL databases holding the instrumental archive could be updated (if there is new information) and also the master `ArchiveLogs.txt` file is updated (changing the number of images and the observed 