USB External Dirve Incremental Backkup Much Slower than Full Backup
I have an external drive (WD Easystore 5TB) connected via USB 3.0. When ACPHO does a full backup to that drive, the transfer rate is reported at 200-300 Mb/s. However, when ACPHO does an incremental backup to that drive, the reported transfer rate is 3-10Mb/s. Why the big difference? Is it due to the read-write and other processing it takes to make an incremental backup, or what?


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Thanks. That is what I thought, but I didn't think it would be such a big difference. I would conclude that also explains why backups to the cloud, being incremental, are only done at about 25% of the available upload speed.
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Yes, it explains the speed of Cloud backups. I find the speed highly variable; the best I can recall getting was 26Mbps on a 100/40 Mbps cable connection; but that was extraordinary. I am now on a 100/20 connection which is not so flash, but in practice makes no difference to cloud backup times. I think server load balancing is also a factor in the relatively low backup rate.
Ian
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My cable ISP rate is 200/10, with SpeedTest measured upload speeds often at 11Mbps, but the overall Cloud backup speed is reported by Acronis in the 2Mbps range. During the actual Cloud backup, Task Manager will show uploads of up to 4Mbps, but the overall lower average is obviously due the overhead factors. That means that if my ISP should offer a faster upload speed plan, it probably wouldn't affect my Cloud backups much.
Thanks for the input, Ian. I have marked the thread as solved.
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