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<blockquote data-quote="usagora" data-source="post: 1850055" data-attributes="member: 60390">I'm assuming you mean a 1TB drive (not 1GB), right?&nbsp; And therefore by USB drive, I'm assuming you're talking about an external hard drive that connects via USB (not a USB stick/flash drive), correct?&nbsp; If I'm incorrect about either of those assumptions, that may be your issue (use a hard disk drive and be sure it's at least the same size if not larger than your main drive depending on how full you tend to keep your main drive and how far in time you want your backups to go).Yes, Time Machine is supposed to automatically delete the oldest backup files for seamless backups.&nbsp; There's not even a UI option to disable this behavior, so unless you've somehow entered a Terminal command to change it, I would suspect the backup drive is the culprit, especially since you've already tried reformatting it.&nbsp; BUT...have you rebooted your Mac lately?&nbsp; If not, might be worth a shot to reformat the back drive again, reboot your Mac, and see if it works properly.&nbsp; If not, then buy a new HDD.</blockquote>

[QUOTE="usagora, post: 1850055, member: 60390"] I'm assuming you mean a 1TB drive (not 1GB), right? And therefore by USB drive, I'm assuming you're talking about an external hard drive that connects via USB (not a USB stick/flash drive), correct? If I'm incorrect about either of those assumptions, that may be your issue (use a hard disk drive and be sure it's at least the same size if not larger than your main drive depending on how full you tend to keep your main drive and how far in time you want your backups to go). Yes, Time Machine is supposed to automatically delete the oldest backup files for seamless backups. There's not even a UI option to disable this behavior, so unless you've somehow entered a Terminal command to change it, I would suspect the backup drive is the culprit, especially since you've already tried reformatting it. BUT...have you rebooted your Mac lately? If not, might be worth a shot to reformat the back drive again, reboot your Mac, and see if it works properly. If not, then buy a new HDD. [/QUOTE]

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