I'm trying to find out the cause of slow and problematic Time Machine backups to a Time Capsule. Each step takes a long time. The preparing and cleaning up steps take about five minutes on their own. Actual transfer speeds during a backup are on the order of 25 to 50 KBps. A 500MB backup can take over a half hour.
Every other Mac in the house backs up to the Time Capsule at normal speeds around 30 to 40 MBps. Using 802.11ac or 802.11n wireless. Depending on the Mac.
The one getting a slow backup speed is a Mac Pro. It it connected to the Time Capsule via Gigabit Ethernet. It is an 8 core 2008 model with 14GB RAM. Speeds remain this slow after a reboot. The only drive is a 1TB SSD Samsung 850EVO connected via SATA III to an add-on PCIe card. Diagnostics show the SSD is normal as is all other hardware.
If I mount the shared Time Capsule drive. I get a transfer rate of 35MBps. From the SSD to Time Capsule via Ethernet.
Disk Utility find no errors on the boot disk or the Time Machine .sparsebundle.
As for other Errors. I've received the following.
- "the identity of the backup disk has changed"
- "Backup Failed" Time Machine couldn't back up to "volume name"
The former I've seen once. The later a couple of times.
Every other Mac in the house backs up to the Time Capsule at normal speeds around 30 to 40 MBps. Using 802.11ac or 802.11n wireless. Depending on the Mac.
The one getting a slow backup speed is a Mac Pro. It it connected to the Time Capsule via Gigabit Ethernet. It is an 8 core 2008 model with 14GB RAM. Speeds remain this slow after a reboot. The only drive is a 1TB SSD Samsung 850EVO connected via SATA III to an add-on PCIe card. Diagnostics show the SSD is normal as is all other hardware.
If I mount the shared Time Capsule drive. I get a transfer rate of 35MBps. From the SSD to Time Capsule via Ethernet.
Disk Utility find no errors on the boot disk or the Time Machine .sparsebundle.
As for other Errors. I've received the following.
- "the identity of the backup disk has changed"
- "Backup Failed" Time Machine couldn't back up to "volume name"
The former I've seen once. The later a couple of times.