Drobo will go to standby when the computer is put into Standby, if the computer uses S3 standby (STR).
If the computer uses S1 standby (POS), then the USB ports are still active (data-wise) and Drobo stays on.
Most computers let you choose between S1 (POS) and S3 (STR) Sleep modes in the BIOS.
Drobo will go to standby when the computer is put into Hibernate (S4) as well, as the system power is turned off and it’s in a state very close to soft-off.
There’s a nice summary of the system power modes here.
In either case there’s no risk of data loss or unfinished business (I’ll clarify in a bit) as long as the device is still present when the system wakes up from sleep/suspend or hibernation. Unless, of course, the machine crashes in the wake process or something - but that’s the fault of the machine, not the device.
Waking from Suspend/Sleep without the device connected can result in unfinished business. It could result in data loss if the OS doesn’t flush the disk cache before going to suspend/sleep, but I’m pretty sure Windows does flush the cache first, as it’s safer. It can also result in BSOD.
Waking from Hibernate without the device connected can only result in unfinished business. It can also result in BSOD.
By data loss I mean a write to the disk that the OS has initiated, but does not complete successfully. “Data loss” can cause filesystem corruption. This would be like disconnecting a drive while it’s in the middle of writing. What the OS was asked to do was not completed successfully.
By unfinished business I mean that all requested writes have completed. However, the system may not have finished what it was doing. This would be like copying two folders to a drive in two separate operations.
You copy the first folder, but before you start to copy the second folder, you pull out the drive.
The first folder’s contents have been safely written and its content is safe. The filesystem is safe too.
What the OS was asked to do (copy the first folder) was completed successfully. What you intended to do (copy both folders), however, did not complete.
Another way to look at this would be closing your browser before you hit Post Reply. Nothing is harmed or damaged, but I didn’t finish was I was doing.