Zlib decompression error: [-3] | Failed ... - Veeam Software
https://www.veeam.com/kb179529.07.2013 · Veeam Backup & Replication 6.5 added network traffic verification in order to detect corruption which might occur when sending data from a proxy to a repository or other proxy. Decompression errors in 6.5 and later are unlikely to be caused by a malfunctioning NIC, router, or other network device if the repository server is using a local disk.