Client backuping Docker.raw gradually slow down to a crawl

I use urbackup to backup my .docker folder (OS: Linux Mint Una), but unlike other big files, the Docker.raw file get loaded gradually slower. Is this normal? A bug? Something not recommended? For now I’m just going to ignore the file, but it would be better to have an actual solution

Also the client is on the same machine as the server, but docker.raw on sda, backup folder on sdb, and urbackup is not running from docker, just directly from Linux Mint

Log:

01/09/22 00:56  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 40% finished 1.33219 GB/3.29027 GB at 190.716 MBit/s
01/09/22 00:57  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 51% finished 1.69131 GB/3.29027 GB at 51.4126 MBit/s
01/09/22 00:58  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 56% finished 1.8694 GB/3.29027 GB at 25.4966 MBit/s
01/09/22 00:59  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 60% finished 1.9854 GB/3.29027 GB at 16.604 MBit/s
01/09/22 01:00  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 63% finished 2.07622 GB/3.29027 GB at 12.9991 MBit/s
01/09/22 01:01  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 65% finished 2.1508 GB/3.29027 GB at 10.6718 MBit/s
01/09/22 01:02  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 67% finished 2.21314 GB/3.29027 GB at 8.92436 MBit/s
01/09/22 01:03  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 68% finished 2.26704 GB/3.29027 GB at 7.71551 MBit/s
01/09/22 01:04  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 70% finished 2.31495 GB/3.29027 GB at 6.85772 MBit/s
01/09/22 01:05  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 71% finished 2.35853 GB/3.29027 GB at 6.23601 MBit/s
01/09/22 01:06  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 72% finished 2.39801 GB/3.29027 GB at 5.65122 MBit/s
01/09/22 01:07  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 73% finished 2.43451 GB/3.29027 GB at 5.22001 MBit/s
01/09/22 01:08  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 75% finished 2.4679 GB/3.29027 GB at 4.77498 MBit/s
01/09/22 01:09  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 75% finished 2.49909 GB/3.29027 GB at 4.46451 MBit/s
01/09/22 01:10  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 76% finished 2.52801 GB/3.29027 GB at 4.14104 MBit/s
01/09/22 01:11  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 77% finished 2.55682 GB/3.29027 GB at 4.12343 MBit/s
01/09/22 01:12  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 78% finished 2.58447 GB/3.29027 GB at 3.95501 MBit/s
01/09/22 01:13  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 79% finished 2.61065 GB/3.29027 GB at 3.74654 MBit/s
01/09/22 01:14  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 80% finished 2.63571 GB/3.29027 GB at 3.5839 MBit/s
01/09/22 01:15  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 80% finished 2.65988 GB/3.29027 GB at 3.45886 MBit/s
01/09/22 01:16  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 81% finished 2.68249 GB/3.29027 GB at 3.23607 MBit/s
01/09/22 01:17  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 82% finished 2.70349 GB/3.29027 GB at 3.00316 MBit/s
01/09/22 01:18  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 82% finished 2.72256 GB/3.29027 GB at 2.72726 MBit/s
01/09/22 01:19  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 83% finished 2.74023 GB/3.29027 GB at 2.5296 MBit/s
01/09/22 01:20  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 83% finished 2.75713 GB/3.29027 GB at 2.41844 MBit/s
01/09/22 01:21  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 84% finished 2.77355 GB/3.29027 GB at 2.35044 MBit/s
01/09/22 01:22  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 84% finished 2.78936 GB/3.29027 GB at 2.26133 MBit/s
01/09/22 01:23  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 85% finished 2.80505 GB/3.29027 GB at 2.24502 MBit/s
01/09/22 01:24  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 85% finished 2.82033 GB/3.29027 GB at 2.18693 MBit/s
01/09/22 01:25  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 86% finished 2.83675 GB/3.29027 GB at 2.34981 MBit/s
01/09/22 01:26  	DEBUG  	Loading "rootfs/home/rustynova/.docker/desktop/vms/0/data/Docker.raw". 86% finished 2.8507 GB/3.29027 GB at 1.9949 MBit/s