Dunno if you have encountered this. I have a Seagate 2GB Desktop external USB3.0 HDD, and it is entirely my Time Machine backup disk. It worked flawlessly on my old Mid-2010 iMac (8GB RAM) and never skipped a beat. Since updating to a Late-2013 iMac (8GB RAM) it does about a few months worth of backups (ONLY via USB2.0 hub, as USB3.0 seems to automatically eject the drive randomly). Apple themselves could not solve the issue (it could be SMC related), but it is WAY more reliable through the powered USB2.0/3.0 hub I use.
I just don't know how Mavericks can "forget" the backup drive, it is still mounted, has the same name, icon etc...????
If anyone here has the same issue, please get back to me. This appears on the Apple help forums, and the only real solution there is use a USB hub as well. This is a real drag, because I do not notice the TM icon for perhaps days, and I would hate to lose days/weeks worth of backups.
PS. Problem temporarily resolved by reselecting the backup drive from lower down the list, in external drives. It does not recreate the entire backup, but continues exactly where it left off?!?!
What is happening here?
NOTE: Not using WD external, refuse to, more issues with firmware on that than with Seagate.
NOTE: Computer remains on 24/7... I did use sleep recently for the first time in months, and that might be the issue... but no solution in sight. I am not keen to update to Yosemite, as it is very laggy on this computer (especially in the GUI), and I cannot restore from my TM backup automatically (need to select items manually).
I have about 800GB backed up, so not looking forward to going through that until absolutely necessary. Last time I "tried" Yosemite, I lost 10 years worth of work backups, as I needed to restart TM drive from scratch ... sigh.
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