Time Machine Backups.. Hardware problem after problem.

I can't seem to get a working Time Machine backup going on my Mac Pro, late 2009 model. It's been problem after problem with everything I've tried. Very frustrating as I definitely need a reliable backup for an extensive payload of work files.

First I tried Western Digital MyBooks that I carried over from a PC. Formatted, set up Time Machine, worked great for about a month. Then Time Machine started to fail and stop backing up. Numerous formats later and the same problem persisted. I swapped MyBooks for another identical 1TB external and had roughly the same problem -- worked fine at first then Time Machine failures after a few weeks of use.

Next up, I tried a Seagate external drive 2TB. Virtually same problems.

Finally, I tried connecting Time Machine with my 2TB Airport Extreme. Not even one backup successfully completed.

It's been a couple months and I have gone for way too long without a reliable backup. I'm looking for alternate hardware and software suggestions, please.

I've looked at Drobos but I'm seeing a ton of complaints and failures cited. What are some other good options? Thanks in advance.

 

I know a lot of NAS devices have HD compatibility problems. What make and brand HDs do you have in yours? Thanks, blueroom.