Backup used to take 10 minutes; now six hours! Any ideas??

[Touchstone64]

Hi all,

I have a DS210j running DSM 3.2-1955. The unit holds 2x2TB drives (configured as Basic dries, formatted EXT4) and I also have 2x2TB SATA-II connected via USB (both formatted as EXT4).

I have staggered (1AM and 3AM), scheduled daily incremental backups configured for both internal drives, one to each USB drive. They used to take about ten minutes to 'realise' nothing needed backing up.

A couple of weeks ago we had a power cut, and after that one of the USB drives performed a full backup each time, but the other backed up incrementally as before. To get back to incremental backups I reformatted the external USB drive and performed a full backup. Now, the drive isn't performing a full backup each night, but it is taking about 6.5 hours to change nothing.

Any ideas how I can get it back to a 'quick' incremental backup? How can I find out more about what it's doing - the log is quite basic. Is there a way to enable verbose logging? Any suggestions or information would be very welcome

I have quite a bit of Unix experience if anyone can point me to a relevant task or job on the OS...

Many thanks for any advice!

[Touchstone64]

Update...

Actually, reading about the other USB backup woes on this forum (e.g. http://forum.synology.com/enu/viewtopic.php?f=160&t=32317), I'm wondering if the problem is with DSM3.2-1955, not the disk/power cut.

The backup that 'works' is on a USB enclosure connected via a "Hi-Speed USB to SATA bridge" from "Initio Corporation" (to quote the DS201j). The one that doesn't is on a USB enclosure connected via a "JM20329 SATA bridge" from "JMicron Technology" (again quoting the DS210j)...

[sjeph8je]

Hi,

in the other post you have the working and not working reversed from what you state here

[Touchstone64]

...in the other post you have the working and not working reversed from what you state here

Duh, you're absolutely right. I've edited the other post. Please accept my apologies; the information in this post is correct. I'll look more closely into the evidence on the DS210j to see if I can make sense of what's going on.