I am running three different backups on my MBP (yes, I like to play it safe): Monthly CCC to HDD TM to USB-C connected HDD - which gives me about 80 MB/sec average backup speed TM to network connected Samba server on Intel NUC with SSD drive - gives 6 - 8 MB/sec (used to run) TM to AirportExtreme with USB drive - which gave 3 - 4 MB/sec What confuses me is the slow performance of TM to a network share. To compare: File copy to the samba share using Finder gives 14 MB/sec, i.e. double TM performance Secure copy (scp in terminal) from the MBP to the samba share gives about 70 MB/sec The network connection is 1 Gbit cabled via a Cisco ASA-5506. The samba server has been upgraded to latest Debian 10 and TimeMachine is now run over SMB protocol instead of AFP. Neither disk, network or cpu shows any real load when running TM (a few percent). Anyone has any good suggestions for how to speed things up?